Each line of the file NGC4147.dat contains the following information. Actual values are shown for star 7714. Col. type value explanation ---- ---- ----- ----------- 1 integer 7714 sequential identification number 2 real 4232.7 x in accompanying image, increases E at 3.0 pixels/arcsec 3 real 2715.9 y in accompanying image, increases N at 3.0 pixels/arcsec 4 real 17.236 B-band magnitude 5 real 0.0047 sigma(B), standard error of the mean 6 integer 54 number of valid photometric measurements in B 7 real 16.490 V-band magnitude 8 real 0.0044 sigma(V), standard error of the mean 9 integer 115 number of valid photometric measurements in V 10 real 15.980 R-band magnitude 11 real 0.0060 sigma(R), standard error of the mean 12 integer 114 number of valid photometric measurements in R 13 real 15.502 I-band magnitude 14 real 0.0089 sigma(I), standard error of the mean 15 integer 70 number of valid photometric measurements in I 16 real 1.390 mean value of the chi image-quality index 17 real 0.221 mean value of the sharp image-quality index 18 real 0.11 value of the variability index 19 real 177.5 weight of the variability index 20-22 h m s 12 10 05.51 Right ascension, equinox J2000.0, epoch late 1990's 23-25 deg min sec +18 32 14.0 Declination, equinox J2000.0, epoch late 1990's Each line of the file ngc4147.dat contains the following information. Actual values are shown for star 7148. Col. type value explanation ---- ---- ----- ----------- 1 integer 7148 sequential identification number 2 real 4385.0 x in accompanying image, increases E at 33.0 pixels/arcsec 3 real 2960.2 y in accompanying image, increases N at 33.0 pixels/arcsec 4 real 20.238 B-band magnitude 5 real 0.0694 sigma(B), standard error of the mean 6 integer 3 number of valid photometric measurements in B 7 real 19.649 V-band magnitude 8 real 0.0511 sigma(V), standard error of the mean 9 integer 2 number of valid photometric measurements in V 10 real 1.627 mean value of the chi image-quality index 11 real -0.108 mean value of the sharp image-quality index 12-14 h m s 12 10 07.14 Right ascension, equinox J2000.0, epoch late 1990's 15-17 deg min sec +18 32 33.6 Declination, equinox J2000.0, epoch late 1990's