Table 1: List of participating observatories by longitude: d is the telescope diameter; $N_{\rm obs}$ is the total number of observations done, i.e. the number of unbinned data; NU, NB, NV, NR, and NI are the numbers of data points in ${\it UBVRI}$ remained after discarding and binning some of the original data; the numbers in brackets refer to the WEBT campaign 2001 alone (May 2001-February 2002).
Observatory d (cm) $N_{\rm obs}$ NU NB NV NR NI
Kyoto, Japan 25 190 (0) 0 0 0 19 (0) 0
Yunnan, China 100 25 (25) 0 2 (2) 2 (2) 7 (7) 0
Mt. Maidanak (T-60), Uzbekistan 60 50 (50) 15 (15) 16 (16) 16 (16) 0 0
Mt. Maidanak (AZT-14), Uzbekistan 50 150 (150) 49 (49) 47 (47) 49 (49) 3 (3) 0
Mt. Maidanak (AZT-22), Uzbekistan 150 418 (418) 50 (50) 87 (87) 65 (65) 108 (108) 61 (61)
Abastumani, Georgia (FSU) 70 1823 (316) 0 276 (36) 232 (0) 903 (213) 150 (0)
Crimean, Ukraine 70 267 (267) 0 67 (67) 67 (67) 67 (67) 66 (66)
Skinakas, Crete 130 510 (239) 0 186 (119) 69 (0) 184 (118) 67 (0)
Tuorla, Finland 103 80 (0) 0 0 79 (0) 0 0
MonteBoo, Czech Republic 62 754 (754) 0 0 0 282 (282) 0
Vallinfreda, Italy 50 98 (0) 0 0 49 (0) 0 0
Perugia, Italy 40 524 (419) 0 0 112 (112) 208 (180) 166 (125)
Greve, Italy 32 55 (0) 0 0 0 0 55 (0)
Torino, Italy 105 487 (54) 0 104 (1) 70 (2) 271 (24) 12 (2)
Sabadell, Spain 50 32 (32) 0 0 3 (3) 12 (12) 0
Guadarrama, Spain 20 3 (3) 0 0 1 (1) 1 (1) 0
Roque (KVA), La Palma 60 322 (0) 0 0 0 152 (0) 0
Roque (KVA), La Palma 35 42 (42) 0 0 10 (10) 10 (10) 0
Roque (JKT), La Palma 100 64 (64) 0 9 (9) 10 (10) 32 (32) 6 (6)
Roque (NOT), La Palma 256 44 (44) 4 (4) 7 (7) 7 (7) 7 (7) 3 (3)
Roque (TNG), La Palma 358 138 (0) 3 (0) 62 (0) 5 (0) 62 (0) 2 (0)
Olin, Connecticut 51 400 (361) 0 0 8 (0) 78 (64) 85 (71)
Hopkins, Massachusetts 60 12 (0) 0 0 0 0 11 (0)
Foggy Bottom, New York 40 248 (83) 0 0 0 248 (83) 0
Boltwood, Canada 40 96 (96) 0 6 (6) 6 (6) 6 (6) 5 (5)
Bell, Kentucky 60 23 (23) 0 0 0 22 (22) 0
St. Louis, Missouri 36 423 (340) 0 10 (4) 40 (16) 161 (137) 39 (15)
Sommers-Bausch, Colorado 60 9 (9) 0 0 4 (4) 4 (4) 0
Lowell, Arizona 180 36 (0) 0 0 18 (0) 0 18 (0)
San Pedro Martir, Mexico 210 9 (9) 0 3 (3) 3 (3) 3 (3) 0
San Pedro Martir, Mexico 150 123 (123) 4 (4) 12 (12) 11 (11) 11 (11) 4 (4)
Total   7455 (3921) 125 (122) 894 (416) 936 (384) 2861 (1394) 750 (358)


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