Post annotation
Note on Name, f_Name  : The name has a format 'Bhhmm.m+ddmmA', where 'B' indicates a name based on B1950 coordinates, followed by the truncated position to 0.1min in right ascension and 1 arcmin in declination, followed by a letter A,B,C,D for components of the multi-component sources.

There are 748 names which are assigned to more than one source; these names are flagged "a", "b", "m" or "p" in the f_Name column:
a,b when the same name exists in the same file (there are two
identical names in main.dat or polar.dat)
m,p when the same name exists in the other file (there are two
identical names, one in main.dat, and the other one in polar.dat)