g the Kalman filtering. After doing the filtering,
    UT1 is added back in. The default is to use UT1S.
 
11. Spacing of Mod file in days: (0.05-1) Just like it sounds. I have
    played around with this, and I have found that it doesn't make much
    different.  Note that the modfile only has 2 digits for the decimal,
    so you should enter in 0.25, 0.5, or 0.1, or something that is evenly
    divisible into 1. If you enter in 0.33333 it will only output the first
    2 digits, and since EOP changes so r