The only new keywords (which exist only for Keck II) are TVFLIP (whether a TV Y flip is necessary) and TVANGL (the angle referred to as "t" above, always 0 or 180).
Keck II also provides INSTFLIP (whether an instrument Y flip is necessary) and INSTANGL (the angle referred to previously as "i"). However, these cannot be used in place of TVFLIP and TVANGL (as noted in the previous section). There is a good case for defining additional instrument-specific keywords (IDSPFLIP and IDSPANGL?) which are analogous to TVFLIP and TVANGL.
We intend providing DCS keywords which contain the results of these formulae and can be used directly to drive compass roses.