void likelihood(long n[2], int mode, int filenum, double ratio, int minplace, 
		int maxplace, double *means[2], long *counts[2],
		double gauss_mean[2], double sd[2], double down[2], 
		FILE *fout, FILE *foutps, FILE *scatter, FILE *scores,
		double a[2], double b[2],
		double low_percent, double high_percent, double error_allowed);
void post_script(FILE *foutps, int minplace, int maxplace, double *likelihood,
		 int no_header, double a, double b, 
		 double low_score, double high_score);
void least_sq_fit(double *m, double *b, double leftend, double rightend, 
		  double *means, double *likelihood, FILE *fout);
double half_box_mean(int minplace, int maxplace, long *counts, double *means);
double percent_mean(long *counts, double *means, double percent, 
		    int  minplace,int maxplace, long number_residues);