fixed typo

v1/input/absscal.c

@@ -161,7 +161,7 @@ int read_allogg2_data(
 void correct_scanditronics(struct Blood *blood, int verbose);
 int correct_allogg(struct Blood *blood);
 int correct_allogg2(struct Blood *blood, int verbose);
-void substract_background(struct Blood *blood);
+void subtract_background(struct Blood *blood);
 int get_calfactors(const char *file,time_t bloodt, double *wcf,
   double *pumpf, int pump, char *isotope, char *caldate, int verbose);
 int find_date(char *str, struct Blood *blood, int verbose);
@@ -385,7 +385,7 @@ int main(int argc, char *argv[])
   /* Subtract background radiation; must be done before decay correction */
   if(blood.background>0.0) {
     if(verbose>=0) printf("subtracting background\n"); 
-    substract_background(&blood);
+    subtract_background(&blood);
   } else if(blood.background<-1.0) {
     if(format==ALLOGG || format==ALLOGG2) {
       if(calfile[0]) {
@@ -1252,7 +1252,7 @@ int correct_allogg2(
 
 /*****************************************************************************/
 /** Subtract background radiation values */
-void substract_background(
+void subtract_background(
   /** Blood data structure for correction. */
   struct Blood *blood
 ) {