Changes in version 2.11

A number of changes and additions were made to implement a new pointing model, named 'Model-5'. Specific details are discussed in the modification request see: http://wiki.gb.nrao.edu/bin/view/Software/ModificationRequest1C407 for additional information. This version contains an error, See notes for version 2.12 below.

• The value of the FITSVER keyword was incremented from 2.10 to 2.11 to indicate the changes to implement model-5.
• The new keywords PNTAZB02 and PNTAZD02 were added, to record the coefficent values of the new traditional model terms. The values are in radians.
• The new keywords PNTAZH00, PNTAZH01, PNTELH00, and PNTELH01 were added to record the values of the hysteresis correction coefficients.
• The new keywords PNTAZR00, PNTELR00 were added to record the values of the rate-based correction coefficients.
• The new keywords PNTLAMBDA1,PNTLAMBDA2, PNTLAMBDA3, were be added to record the average value of the corrections respectively for the scan. Value are in degrees of average correction. For a concise definition of the correction, see PTCS PN-53 equation 48.
• Generally corrected the document, adding units and keywords currently written in the FITS file but not documented here.