Changes in version 1.6

Added Summary dynamic correction (SDYN_AZ1, SDYN_AZ2, SDYN_EL, and SDYN_Y) keywords. Beam offset table offsets changed as described below.

Changed definition of beam offset table. Antenna files with FITSVER equal to '1.6' have beam offset tables written with offsets relative to the axial center of the receiver mount. Assuming beamZ is the selected tracking beam, to determine the offset of a non-tracked beam with FITSVERS=1.6, use:

$$El_{beamY} = El_{indicated} - (beamY_{el offset} - beamZ_{el offset})$$ (1)

$$Az_{beamY} = Az_{indicated} - \frac{(beamY_{xel offset} - beamZ_{xel offset})}{cos(El_{beamY})}$$ (2)

where: $beamZ_{xel offset}$ and $beamZ_{el offset}$ are the beam offsets for the tracked beam, and $beamY_{xel offset}$ , $beamY_{el offset}$ are the offsets for the beam in question.

All other FITVERS versions have beam offsets which are relative to the selected tracking beam, so the subtraction of the tracking beam offset is unecessary:

$$El_{beamY} = El_{indicated} - beamY_{el offset}$$ (3)

$$Az_{beamY} = Az_{indicated} - \frac{beamY_{xel offset}}{cos(El_{beamY})}$$ (4)