KEPLER_THETA

          Maximum  angle  (in  degree) from the disk projected major axis beyond
    which the spectra are not considered in the averaging process.

    This angle is needed because  the projected rotation velocity is  degenerate
    to  zero  along  the  minor axis, which results in a lower effective angular
    resolution in this direction. This effect depends on the disk inclination: a
    larger angle can be used for less inclined disks.

    The default is 60 degree.  The Azimut coverage can be visualized using  com-
    mand SHOW KEPLER_VELO.