gsl_histogram_get_range(hist, 0, &x_min, ¬_used);
range = not_used - x_min;
gsl_histogram_get_range(hist, bins - 1, ¬_used, &x_max);
- assert(range == x_max - not_used);
abscissa_scale = (ch->data_right - ch->data_left) / (x_max - x_min);
ordinate_scale = (ch->data_top - ch->data_bottom) /