updated links in user info

v1/input/extrapol.c

@@ -51,7 +51,7 @@ static char *info[] = {
   "columns. The extrapolation time must be given in same units as are the sample",
   "times in the datafile.",
   " ",
-  "See also: paucinf, avgbolus, fit_meb, fit_exp, fit_feng, fit2dat, tacln",
+  "See also: paucinf, avgbolus, fit_dexp, fit_feng, fit2dat, tacln",
   " ",
   "Keywords: input, plasma, TAC, modelling, simulation",
   0};