OBSERVATORY COORDINATE FILE (typically 'obsys.dat') This file contains geographical locations of observatories. There is one line per observatory. Historically, the information in the first line was used for TOAs tagged with observatory number 1, the second line for number 2, and so on. The tenth line corresponds to observatory 'a', the eleventh to 'b', and so on. This behavior is still invoked if column 71 (observatory number) is blanked. However, an observatory number ('1'-'9' or 'a'-'z') in column 71 will now override the default assignment (based on position in the file). Col Item ----- --------------- 1-15 coordinate 1 16-30 coordinate 2 31-45 coordinate 3 48-48 flag 51-62 observatory name 71-71 observatory one-letter code 74-75 observatory two-letter code If the flag is blank or zero, the coordinates are taken to be latitude (ddmmss.ss), longitude (ddmmss.ss), and elevation (m). If the flag is non-blank, the coordinates are taken as X, Y, Z (m) about the geocenter. Each observatory can have a one-letter code and/or a two-letter code. If an observatoy does not have a one-letter code, a dash ("-") should be entered in place of the one-letter code. Internally within tempo, the following integers are used for the observatory codes. These are also the observatory numbers written to polyco.dat. code number notes @ -1 solar system barycenter; not included in obsys.dat 0 0 geocenter; not included in obsys.dat 1 1 2 2 . . . . . . 9 9 a 10 b 11 . . . . . . z 35 - 36 1st observatory in obsys.dat with no one-digit code listed - 37 2nd observatory in obsys.dat with no one-digit code listed - 38 3rd observatory in obsys.dat with no one-digit code listed . . . . . . maximum value NOBSMAX in dim.h