Polc
A Polc is a polynomial with n x m coefficients, defining the values of a MeqParm on a given domain. For solvable polcs the lower right triangle is ignored, i.e.: all C_ij with i+j > the maximum order of the polc (Max(n,m)). If you wish to use another mask, you can set the masking in the state of the polc:
coeff_mask : array of bool with same size as coeff. Eg. [[F,F,T],[F,F,F]] will only solve for the C02 coefficient.