double calc_mb (double amplitude, double frequency, Station_Struct sta_info, double lat, double lon, double depth);
int read_in_mb_table(char *file);
int read_in_mb_0_table(char *file);
int integer(double number);
double l4pi( double fm1, double f0, double fp1, double fp2, double p);
double q_intrp(float fx, float fy);