This uses a linear method to determine baselines separately and should work only if the starting values are within half a wavelength in any direction of the true values. This is needed if the baseline was wrong by more than half a wavelength.
Offsets are to be given in meters.
The total fitted baseline is also given in meters, as well as the rms of the residuals in phase units. Only the solution with the minimum rms is kept. Searching one baseline in a 0.01 meter range takes 4 seconds on the micro-vax 3400. This procedure file may be executed by the observing program OBS on the control computer BURE01. These differing offsets result in a phase effect proportional to the cosine of elevation.