The type of pointing model to use.

Input Format:

An option from:

• radio - The radio pointing model.
• optical - The optical pointing model.

Context:

In addition to its radio receivers, the CBI has a small optical telescope. This is used for determining the major parts of the pointing model. Unfortunately, given that the telescope and the radio receivers can't be perfectly aligned, the optical telescope requires a different collimation model than the radio telescopes. The Model datatype allows one to specify which pointing model one is refering to.