---

    master_register - IRAF task to register and combine a set of images, i.e. a set of exposures in a given filter. Brief description - here.

    psf_phot - IRAF task combining all major steps to perform a PSF fotometry on an image(s). Brief description and tips - here

    imghstatadd - IRAF task to add image header keywords for statistics section with a chosen size and the stddev from that section (those header keyowrds can be used by master_register).