// import data
newbook;
string fname$=system.path.program$+"Samples\Curve Fitting\Exponential Decay.dat";
impasc;

// begin fit
nlbegin iy:=(1, 2:4) func:=gauss nltree:= mytree mode:=cons;

// iterate till convergence;
nlfit;


// end fit and make a report to get updated tree
nlend out:=1;

// now separate values such as chi-sqr should be available
mytree.chisqr1=;
mytree.chisqr2=;
mytree.chisqr3=;

// now delete the report if you don't want it
layer -d %(__report$);
layer -d %(__fitcurve$);