refined k range is checked to actually be a range

v2/tacfits/fit_dexp.c

@@ -360,6 +360,8 @@ int main(int argc, char **argv)
       fprintf(stderr, "Error: %s\n", errorMsg(status.error));
       tacFree(&tac); return(3);
     }
+    if(kmax<2.0*kmin) {kmax=2.0*kmin; kmin*=0.5;}
+    if(verbose>2) printf(" refined kmin := %g\n kmax := %g\n", kmin, kmax);
     ret=spectralDExp(tac.x, tac.c[0].y, tac.w, tac.sampleNr, kmin, kmax, bfNr,
                      pk, pa, yfit, &status);
     if(ret!=TPCERROR_OK) {