In previous versions, `x_start`, `x_end`, and `x_norm_loc` positions for several modules (**calc_area, lock_peak, norm_bg**) required that the points must exist in the input `x`-array. Now if the `x_start`, `x_end`, and/or `x_norm_loc` input values does not exactly match any data point in the `x`- array, it will pick the nearest existing point.