CONTROL

This menu contains variables which control the performance of the Marquardt-Levenberg (M-L) non-linear least squares fitting.

FIT OPTIONS $\vert$

ONE One iteration only

FLOAT Allow $V^2$ calibration to float

OPT. Optimize step size for M-L.

LAMBDA Gradient-Brute force parameter

TOLERANCE Ratio of smallest over largest eigenvalue allowed

CONVERGENCE Convergence criterion as ratio of new over previous $\chi^2$

Choosing the OPT. option will cause a one-time delay before starting M-L, including the loading of the interferometric data a second time as the optimization of the step size overwrites the currently loaded visibilities. The step size data are written into a file Z_h_steps.xdr.