| chisq | -- | compute chi**2 obs cf mods. |
| fitspec | -- | fit to tabulated models |
| genspec | -- | interpolate tabulated models |
| mgfit | -- | multiple gaussian fits. |
| pfit | -- | fits poly to continuum. |
| sdec | -- | time series to cosine/sine. |
| sfit | -- | fits spline to continuum. |
| tpoly | -- | subtract polys versus HJD. |