diff --git a/output.c b/output.c
index e3a2851..41dc810 100644
--- a/output.c
+++ b/output.c
@@ -58,13 +58,13 @@ void OutputCN(COMMAND *com, HEAD *head, TYPE *type, DATASET *cn){
 
   cn_ = malloc(sizeof(double*) * cn->n);
   for (i=0; i<cn->n; i++) cn_[i] = malloc(sizeof(double) * cn->m);
-  for (j=0; j<cn->m; j++) cn_[0][j] = cn->y[0][j];
  
   for (i=1; i<cn->n; i++){
     for (j=0; j<cn->m; j++){
       cn_[i][j] = cn_[i-1][j] + cn->y[i][j];
     }
   }
+  for (j=0; j<cn->m; j++) cn_[0][j] = cn->y[0][j];
 
   sprintf(outfile, "%s.cn", com->outbase);
   f = fopen(outfile, "w");