1 files changed, 7 insertions, 0 deletions
diff --git a/src/pj_msfn.cpp b/src/pj_msfn.cpp
new file mode 100644
index 00000000..999e73a7
--- /dev/null
+++ b/src/pj_msfn.cpp
@@ -0,0 +1,7 @@
+/* determine constant small m */
+#include <math.h>
+#include "projects.h"
+	double
+pj_msfn(double sinphi, double cosphi, double es) {
+	return (cosphi / sqrt (1. - es * sinphi * sinphi));
+}