Documentation on histo

Task: histo
Purpose: Find statistics of image and plot simple histogram
Categories: map analysis

        HISTO is a Miriad task which finds the minimum, maximum, mean and
        rms deviation from the mean for the selected region of the image.
        It also displays a simple histogram which is useful for determining
        the clip levels for clean and selfcal.

Key: in
        The input file name. No default.

Key: region
        The region of interest of the input. Default is the entire input.
        See the Users Manual for instructions on how to specify this.
        Pixel blanking is not supported; all pixels in the selected region
        are used.

Key: range
        The range in pixel values over which the histogram is calculated.
        The default is the image minima and maxima.

Key: nbin
        The number of bins used in the histogram. Default is 16.