The units are in seconds. The first line controls which and how the EOP are estimated. The first of these lines holds two pairs of values, the first pair controlling the X and Y pole estimate, the second pair controlling the UT1 estimate. The second position causes a piecewise-linear, continuous estimates. The next line sets how frequently these EOP corrections are estimated.
Units are in seconds.
This limit applies to all EOP parameter estimates. The next set of lines name auxiliary information files. Blank lines imply no outside information is provided. The final line simply identifies the end of this section. Because the constraint control identifiers can appear in any order, the various possible identifiers will be listed with descriptions.