I wish to create a pointing model for my DDM 85. The list of corrections shows many terms

that seem to map to a TPOINT like model, but there are two listed corrections that

aren't obvious to me. These are Pier Correction RA and Pier Correction DE. Is there

documentation to indicate what the formula is applied? For example, in TPOINT collimation

is CH and the formula is CH sec(dec) applied to change in hour angle.