diff --git a/src/parameter.cpp b/src/parameter.cpp
--- a/src/parameter.cpp
+++ b/src/parameter.cpp
@@ -19,9 +19,9 @@
  *
  */
 
+// WARNING: This file is automatically generated by make_parameter_source.pl.
 // Do not edit. All edits will be discarded.
 
-
 #include "parameter.h"
 #include <cstdio>
 #include <cstring>
@@ -186,8 +186,8 @@ Parameter::Parameter() {
   b4 = false;
   dir1 = strdup(".");
   dir2 = strdup(".");
-  export_interval = 100;
-  export_fn_prefix = strdup("CELLDATA");
+  export_interval = 0;
+  export_fn_prefix = strdup("cell.");
 }
 
 Parameter::~Parameter() {
@@ -347,8 +347,8 @@ void Parameter::Read(const char *filenam
   dir2 = sgetpar(fp, "dir2", ".", true);
   if (strcmp(dir2, "."))
     MakeDir(dir2);
-  export_interval = igetpar(fp, "export_interval", 100, true);
-  export_fn_prefix = sgetpar(fp, "export_fn_prefix", "CELLDATA", true);
+  export_interval = igetpar(fp, "export_interval", 0, true);
+  export_fn_prefix = sgetpar(fp, "export_fn_prefix", "cell.", true);
 }
 
 const char *sbool(const bool &p) {
@@ -1893,4 +1893,3 @@ ostream &operator<<(ostream &os, Paramet
     return os;
 }
 
-/* finis */