2011A&A...532A.101R

Query : 2011A&A...532A.101R

2011A&A...532A.101R - Astronomy and Astrophysics, volume 532A, 101-101 (2011/8-1)

Lunar occultations of 184 stellar sources in two crowded regions toward the Galactic Bulge.

RICHICHI A., CHEN W.P., FORS O. and WANG P.F.

Abstract (from CDS):

Lunar occultations (LO) provide a unique combination of high angular resolution and sensitivity at near-infrared wavelenghts. At the ESO Very Large Telescope, it is possible to achieve about 1 milliarcsecond (mas) resolution and detect sources as faint as K≃12mag. We have taken advantage of a passage of the Moon over two crowded and reddened regions in the direction of the inner part of the Galactic bulge to obtain a high number of occultation light curves over two half nights. Our goal was to detect and characterize new binary systems, and to investigate highly extincted and relatively unknown infrared sources in search of circumstellar shells and similar peculiarities. Our target list included a significant number of very late-type stars, but the majority of the sources was without spectral classification. An LO event requires the sampling of the light curve at millisecond rates to permit a detailed study of the diffraction fringes. For this, we used the so-called burst mode of the ISAAC instrument at the Melipal telescope. Our observing efficiency was ultimately limited by overheads for telescope pointing and data storage to about one event every three minutes. We could record useful light curves for 184 sources. Of these, 24 were found to be binaries or multiples, all previously unknown. The projected separations are as small as 7.5mas, and the magnitude differences as high as ΔK=6.5mag. Additionally we could also establish for the first time the resolved nature of at least two more stars, along with an indication of circumstellar emission. We were also able to put upper limits on the angular size of about 165 unresolved stars, an information that combined with previous and future observations will be very helpful in establishing a list of reliable calibrators for long baseline interferometers. Many of the newly detected companions are beyond the present capabilities of other high angular resolution techniques, but some could be followed up by long baseline interferometry or adaptive optics. From estimates of the stellar density we conclude that statistically the influence of chance alignments appears to be negligible. We infer that most cases are probably giant-dwarf pairs.

Abstract Copyright: ∼

Journal keyword(s): techniques: high angular resolution - occultations - binaries: general - stars: fundamental parameters - infrared: stars - circumstellar matter

VizieR on-line data: <Available at CDS (J/A+A/532/A101): table2.dat table3.dat>

Simbad objects: 186

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Number of rows : 186
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14407 0
2 2MASS J18012777-2538123 * 18 01 27.7686975960 -25 38 12.379146144           ~ 2 0
3 2MASS J18014156-2539527 LP? 18 01 41.5590441672 -25 39 52.803778464           ~ 3 0
4 IRAS 17586-2536 Mi* 18 01 45.6125597472 -25 36 01.466326584         18.388 ~ 4 0
5 2MASS J18015392-2534372 LP? 18 01 53.9336288760 -25 34 37.276183236           ~ 3 0
6 2MASS J18015464-2529273 LP? 18 01 54.6528355632 -25 29 27.347251128           ~ 3 0
7 2MASS J18015800-2549077 LP? 18 01 58.0095848775 -25 49 07.803277454           ~ 3 0
8 2MASS J18020084-2543076 Mi* 18 02 00.8557205112 -25 43 07.694430384     22.129   14.695 ~ 3 0
9 2MASS J18020469-2553488 * 18 02 04.6948715904 -25 53 48.852957120           ~ 2 0
10 2MASS J18022315-2530237 Mi* 18 02 23.1543148344 -25 30 23.848415532         17.612 ~ 5 0
11 HD 314951 ** 18 02 26.3686081248 -25 55 37.326457884   11.14 9.77     K5 3 0
12 IRAS 17594-2539 ** 18 02 31.8326566992 -25 39 06.759468540           ~ 2 0
13 2MASS J18024042-2549567 LP? 18 02 40.4208083352 -25 49 56.771444496           ~ 2 0
14 2MASS J18024090-2552007 * 18 02 40.9137118344 -25 52 00.849394056           ~ 1 0
15 2MASS J18024492-2535538 * 18 02 44.9272077432 -25 35 53.961185760           ~ 2 0
16 2MASS J18025652-2532392 ** 18 02 56.5220913552 -25 32 39.330797676           ~ 1 0
17 2MASS J18030392-2542136 LP? 18 03 03.9259565304 -25 42 13.642753068           ~ 3 0
18 2MASS J18030504-2536574 LP? 18 03 05.0521968120 -25 36 57.443896872           ~ 3 0
19 2MASS J18030533-2532570 LP? 18 03 05.3430882288 -25 32 57.034178304           ~ 2 0
20 2MASS J18030699-2543447 LP? 18 03 06.9991914000 -25 43 44.796235080           ~ 3 0
21 2MASS J18030885-2527400 * 18 03 08.8467812808 -25 27 39.942783936           ~ 2 0
22 2MASS J18030887-2535164 * 18 03 08.872 -25 35 16.43           ~ 2 0
23 IRAS 18002-2538 LP* 18 03 21.5963490744 -25 38 36.863112552   15.97 13.65 13.10 9.54 ~ 3 0
24 IRAS 18003-2526 Mi* 18 03 26.5670371190 -25 26 10.373770344         16.641 ~ 5 0
25 2MASS J18032661-2538323 * 18 03 26.6152769400 -25 38 32.311682520           ~ 2 0
26 2MASS J18033221-2541506 * 18 03 32.215 -25 41 50.67           ~ 2 0
27 IRAS 18004-2547 mul 18 03 33.4 -25 47 41           ~ 2 1
28 2MASS J18033362-2547375 Mi* 18 03 33.6324110880 -25 47 37.467025548     21.521   13.26 ~ 4 0
29 2MASS J18033401-2525313 LP? 18 03 34.0104629928 -25 25 31.345141152           ~ 3 0
30 2MASS J18033459-2544130 * 18 03 34.6006774632 -25 44 13.057118700           ~ 2 0
31 2MASS J18033522-2523185 LP* 18 03 35.2290196560 -25 23 18.387581712           ~ 2 0
32 IRAS 18006-2533 Mi* 18 03 46.3130715528 -25 33 15.339496320     18.682   12.398 ~ 4 0
33 2MASS J18035200-2547316 LP? 18 03 51.9995803008 -25 47 31.487577612           ~ 3 0
34 2MASS J18035693-2539570 LP* 18 03 56.9281457400 -25 39 57.089154096           ~ 3 0
35 2MASS J18040356-2523142 ** 18 04 03.5613799488 -25 23 14.256903156           ~ 1 0
36 2MASS J18040728-2539532 Mi* 18 04 07.2856892976 -25 39 53.237240244     21.492   13.820 ~ 3 0
37 IRAS 18010-2544 mul 18 04 11.9 -25 44 23           ~ 1 1
38 2MASS J18041207-2544225 LP? 18 04 12.0652330728 -25 44 21.804905544           ~ 2 0
39 AKARI-IRC-V1 J1804121-254425 LP? 18 04 12.0947112696 -25 44 25.761529644           ~ 2 0
40 HD 315063 * 18 04 15.3096752424 -25 25 32.875298688   11.12 9.42     K5 3 0
41 2MASS J18042112-2533526 * 18 04 21.1265741304 -25 33 52.754339268           ~ 2 0
42 2MASS J18043001-2531141 LP* 18 04 30.0168606264 -25 31 14.208989448           ~ 3 0
43 2MASS J18043026-2541466 LP? 18 04 30.2672875896 -25 41 46.658786100           ~ 3 0
44 2MASS J18043132-2527356 * 18 04 31.3489139352 -25 27 35.644040352           ~ 2 0
45 2MASS J18044287-2544318 LP* 18 04 42.8785179984 -25 44 31.934998284           ~ 3 0
46 2MASS J18044594-2527198 LP? 18 04 45.9363039264 -25 27 19.865880864           ~ 3 0
47 HD 164972 * 18 04 48.4876817592 -25 36 20.513065356   7.70 7.19     F2/3II 27 0
48 2MASS J18045257-2528135 Mi* 18 04 52.5785142264 -25 28 13.576395180         15.549 ~ 4 0
49 IRAS 18018-2524 LP? 18 04 53.7116943288 -25 24 22.625947800       15.04 10.48 ~ 2 0
50 2MASS J18050733-2543282 LP* 18 05 07.3498554048 -25 43 28.322220900           ~ 2 0
51 2MASS J18050977-2543351 Mi* 18 05 09.779 -25 43 35.18         14.664 ~ 2 0
52 IRAS 18021-2529 Mi* 18 05 10.9178605800 -25 29 25.750136148         15.945 ~ 4 0
53 IRAS 18022-2525 Mi* 18 05 20.3892662952 -25 24 57.282827220         14.180 ~ 4 0
54 2MASS J18052602-2523384 * 18 05 26.0249500584 -25 23 38.433504228           ~ 2 0
55 2MASS J18052646-2520179 LP? 18 05 26.4606962520 -25 20 17.914486596           ~ 3 0
56 2MASS J18053347-2537524 Mi* 18 05 33.4712094864 -25 37 52.453441416     19.286   13.203 ~ 4 0
57 2MASS J18053438-2540309 ** 18 05 34.3908360528 -25 40 31.154947968           ~ 1 0
58 IRAS 18026-2543 LP* 18 05 42.1299810048 -25 43 19.668778860           ~ 3 0
59 Ve 4-66 LP* 18 05 43.7288981664 -25 14 23.443724652     13.5 13.06   M8+: 9 0
60 2MASS J18054382-2537288 Mi* 18 05 43.8336801912 -25 37 28.873847208     19.275   13.234 ~ 4 0
61 IRAS 18026-2540 LP* 18 05 44.9100144624 -25 40 39.854543016           ~ 2 0
62 MC79 1-187 S* 18 05 55.7545945176 -25 40 08.134330512       11.43   S3*4 8 0
63 IRC -30355 LP* 18 06 01.7572761624 -25 26 09.814786404   12.20 11.00     M6 6 0
64 2MASS J18061354-2515305 Mi* 18 06 13.5501797472 -25 15 30.449538036     19.143   13.293 ~ 5 0
65 2MASS J18061707-2523008 LP? 18 06 17.0548104072 -25 23 00.631075668           ~ 3 0
66 IRAS 18033-2525 Mi* 18 06 24.396 -25 25 35.39         18.933 ~ 2 0
67 IRAS 18034-2509 Mi* 18 06 29.6013738118 -25 09 21.176489014         15.552 ~ 4 0
68 2MASS J18063098-2509319 * 18 06 30.9873901728 -25 09 31.863689784           ~ 1 0
69 2MASS J18063720-2514416 * 18 06 37.1829340656 -25 14 42.138982968           ~ 1 0
70 IRAS 18035-2529 OH* 18 06 37.74984 -25 29 27.7260           O-rich 8 0
71 IRAS 18037-2515 Mi* 18 06 47.8853598168 -25 14 55.640201208     21.677   14.488 ~ 6 0
72 2MASS J18064977-2537355 LP* 18 06 49.7780845320 -25 37 35.592994704           ~ 3 0
73 HD 315192 * 18 06 50.9141953944 -25 29 56.202103356   11.65 9.95     M0 3 0
74 2MASS J18065490-2530316 * 18 06 54.8949490920 -25 30 31.752727668           ~ 2 0
75 2MASS J18071147-2509208 LP? 18 07 11.4722510304 -25 09 20.803751676           ~ 3 0
76 HD 315178 Em* 18 07 13.9897756512 -25 16 47.408405700 10.92 10.96 10.38 10.19   B8 15 0
77 2MASS J18071918-2524448 * 18 07 19.1731522824 -25 24 44.783047656           ~ 2 0
78 IRAS 18042-2517 OH* 18 07 20.6175382872 -25 17 19.021261128           O-rich 8 0
79 HD 165517 Be* 18 07 27.2509608168 -25 06 16.492632048 8.42 9.30 9.10 9.16   B0Ia(n) 37 0
80 2MASS J18072731-2532426 LP* 18 07 27.3180502296 -25 32 42.747401976           ~ 3 0
81 HD 165530 ** 18 07 34.6326275928 -25 34 11.575226424   9.33 8.40 7.94   G6/8III+AV 13 0
82 IRAS 18045-2524 LP? 18 07 43.4771607696 -25 24 28.788748200           ~ 3 0
83 IRAS 18047-2533 Mi* 18 07 49.5243230640 -25 32 39.229076508     20.400   13.239 ~ 5 0
84 2MASS J18081328-2523474 LP* 18 08 13.2838209744 -25 23 47.341845492           ~ 3 0
85 2MASS J18081825-2521370 LP* 18 08 18.2429805192 -25 21 36.937578636           ~ 2 0
86 OGLE BLG-LPV-217134 Mi* 18 08 27.5197426008 -25 18 29.444655528         15.298 ~ 3 0
87 IRAS 18054-2524 Mi* 18 08 34.2441811368 -25 23 30.688973124         16.548 ~ 4 0
88 V* V3792 Sgr EB* 18 08 54.0424828728 -25 28 22.986362496   6.70 6.71     B3/5IV 60 0
89 CD-25 12793B * 18 08 54.9423889032 -25 28 17.200697988   8.82 8.76     B9IV 18 0
90 2MASS J18541928-2358016 * 18 54 19.2836445456 -23 58 01.621521732           ~ 2 0
91 CD-24 14823 * 18 54 38.7534335160 -24 03 21.959262108   12.18 10.93     ~ 1 0
92 TYC 6860-1491-1 ** 18 54 53.1975 -23 57 03.641   11.734 10.598     ~ 5 0
93 2MASS J18550100-2408394 LP* 18 55 01.0047497832 -24 08 39.441872292           ~ 3 0
94 2MASS J18550303-2355559 * 18 55 03.0220637208 -23 55 55.987026996           ~ 2 0
95 TYC 6860-1664-1 * 18 55 07.5503572416 -23 54 13.550702076   12.19 11.23     ~ 2 0
96 TYC 6860-1711-1 * 18 55 07.8095122656 -24 03 56.407991148   13.14 11.08     ~ 2 0
97 HD 175159 * 18 55 09.9794678040 -24 01 05.639504088   11.21 9.86     K1(III) 6 0
98 2MASS J18551118-2413072 LP? 18 55 11.1934589496 -24 13 07.099882536           ~ 3 0
99 2MASS J18552223-2412461 ** 18 55 22.2353073312 -24 12 46.188696384           ~ 1 0
100 2MASS J18552401-2349283 ** 18 55 24.0210411096 -23 49 28.333744896           ~ 1 0
101 ATO J283.8848-24.2106 ** 18 55 32.3396503512 -24 12 38.595927960           ~ 3 0
102 ATO J283.8872-23.9904 LP* 18 55 32.9292541896 -23 59 25.649378700           ~ 4 0
103 2MASS J18553706-2411230 * 18 55 37.0738359240 -24 11 23.190637704           ~ 2 0
104 2MASS J18553777-2349547 * 18 55 37.7754630864 -23 49 54.866828172           ~ 2 0
105 2MASS J18554220-2415597 * 18 55 42.2038259256 -24 15 59.756323968           ~ 2 0
106 2MASS J18554320-2411418 * 18 55 43.2012309624 -24 11 41.865276408           ~ 2 0
107 ATO J283.9531-24.0298 LP? 18 55 48.7424123376 -24 01 47.489930688           ~ 4 0
108 2MASS J18554945-2400538 * 18 55 49.4520699984 -24 00 53.826417324           ~ 2 0
109 2MASS J18555632-2400073 * 18 55 56.3341138752 -24 00 07.384779612           ~ 1 0
110 ATO J283.9890-23.9040 LP? 18 55 57.3657862152 -23 54 14.554730880           ~ 4 0
111 2MASS J18555913-2403339 * 18 55 59.1386453544 -24 03 33.939187020           ~ 2 0
112 2MASS J18561672-2345402 * 18 56 16.7205456384 -23 45 40.217959908           ~ 1 0
113 2MASS J18561680-2406431 * 18 56 16.8070835544 -24 06 43.222550904           ~ 2 0
114 2MASS J18561788-2358243 * 18 56 17.8837252248 -23 58 24.399226848           ~ 1 0
115 2MASS J18562006-2357173 * 18 56 20.0703195624 -23 57 17.407156104           ~ 2 0
116 2MASS J18563747-2408447 * 18 56 37.4739113400 -24 08 44.785523940           ~ 2 0
117 ATO J284.1573-24.1770 LP* 18 56 37.7457661824 -24 10 37.672599972           ~ 5 0
118 2MASS J18564563-2354023 * 18 56 45.6289399248 -23 54 02.347529688           ~ 2 0
119 2MASS J18564695-2349245 * 18 56 46.9489797288 -23 49 24.506871960           ~ 1 0
120 2MASS J18564920-2400465 * 18 56 49.2123835704 -24 00 46.565360100           ~ 2 0
121 TYC 6860-945-1 * 18 56 53.8746512760 -23 55 14.651281956   12.74 12.08     ~ 2 0
122 ATO J284.2307-23.7495 ** 18 56 55.3724722968 -23 44 58.235174016           ~ 3 0
123 2MASS J18565615-2346249 * 18 56 56.1483390336 -23 46 24.922610832           ~ 2 0
124 TYC 6860-909-1 * 18 57 02.6219920632 -24 10 28.366133088   12.72 11.69     ~ 2 0
125 2MASS J18570282-2358475 * 18 57 02.8322490864 -23 58 47.583696036           ~ 2 0
126 2MASS J18570432-2351321 * 18 57 04.3196138472 -23 51 32.176026468           ~ 2 0
127 HD 175601A * 18 57 09.2260810896 -23 51 58.357074456   10.67 10.38 10.29   A1V 16 0
128 HD 175601B * 18 57 09.4594982424 -23 52 07.717448640   11.09 10.56     A(3)V 10 0
129 IRAS 18543-2352 LP? 18 57 25.0679999664 -23 48 19.273157136           ~ 3 0
130 IRAS 18544-2406 LP* 18 57 28.5515385504 -24 02 40.204568832           ~ 2 0
131 2MASS J18573272-2343187 * 18 57 32.7251593896 -23 43 18.711215832           ~ 2 0
132 2MASS J18573657-2405454 * 18 57 36.5774423520 -24 05 45.458600424           ~ 2 0
133 2MASS J18574519-2354457 * 18 57 45.2042781840 -23 54 45.671184180           ~ 2 0
134 UCAC4 331-187324 * 18 57 45.7577277552 -23 49 49.061807040   12.749 11.319 11.030   ~ 7 0
135 2MASS J18575364-2400373 * 18 57 53.6459583072 -24 00 37.297311732           ~ 1 0
136 ATO J284.4746-23.7662 LP* 18 57 53.9085839160 -23 45 58.319046468           ~ 4 0
137 HD 175791 ** 18 58 02.761317 -23 37 08.27458   11.17 10.69     G0V 4 0
138 2MASS J18580488-2403296 * 18 58 04.8830108856 -24 03 29.633242752           ~ 2 0
139 IRAS 18551-2344 LP? 18 58 09.3977956248 -23 40 44.770906560           ~ 3 0
140 2MASS J18580978-2343262 LP* 18 58 09.7808556576 -23 43 26.299762824           ~ 3 0
141 2MASS J18580998-2355311 * 18 58 09.9862687152 -23 55 31.131257196           ~ 2 0
142 2MASS J18581647-2340114 LP? 18 58 16.4705305680 -23 40 11.692055316           ~ 3 0
143 HD 175851 Pe* 18 58 16.6146628872 -23 43 55.593825132   10.76 10.26     F2V 6 0
144 2MASS J18581996-2334007 * 18 58 19.9656538008 -23 34 00.796436580           ~ 2 0
145 TYC 6860-1121-1 PM* 18 58 21.6572656392 -23 38 40.655050980   11.91 11.17     ~ 3 0
146 2MASS J18583937-2332312 * 18 58 39.3655141632 -23 32 31.190298468           ~ 2 0
147 IRAS 18558-2354 LP? 18 58 54.5404057176 -23 49 51.938360292           ~ 3 0
148 TYC 6873-682-1 Pe* 18 58 54.8042697816 -23 29 08.640471228   12.37 11.83     ~ 3 0
149 2MASS J18585553-2329395 * 18 58 55.5393711864 -23 29 39.585937956           ~ 2 0
150 2MASS J18585736-2342464 Pe* 18 58 57.3572571528 -23 42 46.312420932           ~ 3 0
151 2MASS J18585782-2351145 * 18 58 57.8228539776 -23 51 14.572333908           ~ 2 0
152 2MASS J18591262-2346443 * 18 59 12.6265556112 -23 46 44.439469680           ~ 1 0
153 2MASS J18591792-2350546 * 18 59 17.9220194112 -23 50 54.711563604           ~ 2 0
154 TYC 6873-584-1 * 18 59 24.0804604128 -23 41 42.646970652   14.21 11.28     ~ 3 0
155 2MASS J18592411-2335094 * 18 59 24.1201543632 -23 35 09.515722956           ~ 1 0
156 ATO J284.8831-23.9181 Mi* 18 59 31.9503830664 -23 55 05.340632844           ~ 6 0
157 2MASS J18593674-2346506 * 18 59 36.7544696616 -23 46 50.670433380           ~ 1 0
158 V* AR Sgr RV* 18 59 42.1480877976 -23 42 26.571919320   10.43 9.61     G4 26 0
159 2MASS J18595396-2334060 * 18 59 53.9650599192 -23 34 06.073078692           ~ 2 0
160 2MASS J18595823-2339176 * 18 59 58.2343842648 -23 39 17.585125236           ~ 3 0
161 2MASS J18595891-2331159 * 18 59 58.9155461688 -23 31 15.862004832           ~ 1 0
162 TYC 6873-739-1 * 19 00 04.4422055400 -23 26 07.492033500   12.66 11.64     ~ 3 0
163 2MASS J19000813-2343368 * 19 00 08.1389247936 -23 43 36.784267392           ~ 1 0
164 ATO J285.0548-23.6698 ** 19 00 13.1443965096 -23 40 11.265464604           ~ 3 0
165 2MASS J19001505-2348245 * 19 00 15.0602857056 -23 48 24.504320700           ~ 2 0
166 ATO J285.0668-23.8326 ** 19 00 16.0292876160 -23 49 57.519908256           ~ 4 0
167 TYC 6873-1159-1 * 19 00 29.0837465880 -23 40 46.689453876   11.93 11.14     ~ 3 0
168 2MASS J19002919-2323136 * 19 00 29.2019823624 -23 23 13.696940328           ~ 1 0
169 2MASS J19003871-2330374 * 19 00 38.7166322136 -23 30 37.524034224           ~ 2 0
170 CD-23 14943 * 19 00 42.6222585672 -23 26 33.306829692   11.73 10.45     ~ 6 0
171 2MASS J19004442-2339386 LP? 19 00 44.4389411448 -23 39 38.697307848           ~ 3 0
172 TYC 6873-625-1 * 19 00 47.9741542008 -23 24 05.646964680   12.80 11.29     ~ 3 0
173 HD 176364 * 19 00 50.7540772296 -23 17 22.229906784   10.36 9.36     G8IV 6 0
174 2MASS J19005121-2333311 * 19 00 51.2079869856 -23 33 31.220067276           ~ 1 0
175 TYC 6873-1177-1 ** 19 01 08.8541591508 -23 17 36.933549147   11.96 11.34     ~ 1 0
176 2MASS J19011187-2323074 ** 19 01 11.8724406456 -23 23 07.456399224           ~ 1 0
177 2MASS J19011673-2332578 * 19 01 16.7411617392 -23 32 57.912372096           ~ 2 0
178 2MASS J19012148-2332350 * 19 01 21.4887795888 -23 32 35.164324860           ~ 1 0
179 ATO J285.3461-23.7094 LP* 19 01 23.0818651416 -23 42 34.120606356           ~ 4 0
180 2MASS J19012789-2336241 * 19 01 27.9024621336 -23 36 24.141380364           ~ 2 0
181 TYC 6873-851-1 * 19 01 35.5684237152 -23 16 46.975901232   11.64 11.12     ~ 2 0
182 TYC 6873-564-1 * 19 01 40.6378645320 -23 32 31.422199092   12.88 11.49     ~ 3 0
183 TYC 6873-749-1 * 19 01 52.4297047224 -23 39 27.810786384   12.82 11.40     ~ 3 0
184 ATO J285.4883-23.5834 LP* 19 01 57.2060169000 -23 35 00.199128876           ~ 4 0
185 2MASS J19021893-2330540 * 19 02 18.9354766344 -23 30 54.100339308           ~ 2 0
186 NAME Galactic Bulge reg ~ ~           ~ 4297 0

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