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MFIT /STEP

          [SIC\]MFIT Y=f(X,&a,...) /STEP A2 B2 ...

    A2 B2 ... are used to pass the unity vectors (steps) for  the  iteration
    on parameters &A &B (defaulted to 0.1). Poor choice of initial steps may
    lead to non convergence. Too small steps will not help  converging  when
    one starts too far from the solution. Too large steps may lead to incor-
    rect evaluation of the parameter errors. The optimal step for the deter-
    mination  of  the  errors is about the error bar, so that all parameters
    become dimensionless.


Gildas manager 2011-09-07