+/* Plot a gsl_histogram */
+void histogram_plot(const gsl_histogram *hist, const char *factorname,
+ const struct normal_curve *norm, short show_normal);
+
+
+/* Create a gsl_histogram and set it's parameters based upon
+ x_min, x_max and bins.
+ The caller is responsible for freeing the histogram.
+*/
+gsl_histogram * histogram_create(double bins, double x_min, double x_max) ;
+