undo set_par_fun

  Hi,

how do I undo the effects of set_par_fun? Below is a minimal example of 
using set_par_fun to link one parameter to another, and then trying to 
unlink the parameter in obvious ways.

Thanks,

Maurice


isis> fit_fun ("gauss(1)+gauss(2)");
isis> set_par_fun ("gauss(2).area", "gauss(1).area*2.");
isis> list_par;
gauss(1)+gauss(2)
  idx  param        tie-to  freeze         value         min         max
   1  gauss(1).area     0     0                1           0           
0  photons/s/cm^2
   2  gauss(1).center   0     0               12           0           0  A
   3  gauss(1).sigma    0     0            0.025       1e-06           1  A
   4  gauss(2).area     0     1                2           0           
0  photons/s/cm^2
#=>  gauss(1).area*2.
   5  gauss(2).center   0     0               12           0           0  A
   6  gauss(2).sigma    0     0            0.025       1e-06           1  A
isis> set_par ("gauss(2).area", 1);
isis> list_par;
gauss(1)+gauss(2)
  idx  param        tie-to  freeze         value         min         max
   1  gauss(1).area     0     0                1           0           
0  photons/s/cm^2
   2  gauss(1).center   0     0               12           0           0  A
   3  gauss(1).sigma    0     0            0.025       1e-06           1  A
   4  gauss(2).area     0     1                2           0           
0  photons/s/cm^2
#=>  gauss(1).area*2.
   5  gauss(2).center   0     0               12           0           0  A
   6  gauss(2).sigma    0     0            0.025       1e-06           1  A
isis> untie (4);
isis> list_par;
gauss(1)+gauss(2)
  idx  param        tie-to  freeze         value         min         max
   1  gauss(1).area     0     0                1           0           
0  photons/s/cm^2
   2  gauss(1).center   0     0               12           0           0  A
   3  gauss(1).sigma    0     0            0.025       1e-06           1  A
   4  gauss(2).area     0     1                2           0           
0  photons/s/cm^2
#=>  gauss(1).area*2.
   5  gauss(2).center   0     0               12           0           0  A
   6  gauss(2).sigma    0     0            0.025       1e-06           1  A
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