stplot: General plotting utilities.
- igi: Interactive Graphics Interpreter.
- sgraph: Graph one or more image sections or lists.
- psikern: IRAF GIO Kernel to produce PostScript output.
- axispar: Specify axis and scaling parameters (pset for ‘sgraph’)
- dvpar: Specify device parameters (pset)
- pltpar: Specify graph parameters (pset for ‘sgraph’).
The 'stplot' package includes general purpose plotting tasks tailored toward ST4GEM data formats; that is, tables and group format image files. These tasks include:
- sgraph
- The 'sgraph' task includes all of the functions of the IRAF 'plot.graph' task, but adds the ability to plot from ST4GEM tables (images and text files were supported by 'graph'). In 'sgraph', you can plot a single column against a row, or a column against another column.
- depind
- The 'depind' task prints pairs of dependent and independent pixel values from two one-dimensional images to STDOUT. This may be piped to 'sgraph' or 'plot.graph' to plot one image line (spectrum) against another.
- skymap
- The 'skymap' task interprets an ST4GEM table as a catalog of coordinates and brightnesses to produce a star chart. That is, it plots symbols whose size depends on brightness and whose position on the plot is a projection of the celestial coordinates. There is an interactive interface that allows a user to roam among different parts of the catalog, change the chart scale, and perform other actions.
- Group Format
- Three tasks support group format ST4GEM images and plot more
than one group member on a single graph.
- grlist
- A generic task to permit converting a range of groups to a list of image names. The output list may be used by any task that accepts alist of images as input.
- grplot
- Overplots selected members on a single plot
- grspec
- Uses the 'noao.onedspec.specplot' task to allow interaction with a plot of several group members.
- fieldplot
- The 'fieldplot' task is a general purpose task to draw arrows representing a vector field, that is, directions and magnitudes. Data are read from STDIN to represent the coordinates of a point and the field vector. The vector may be either a pair of projected magnitudes or the absolute magnitude and direction. The magnitude may be scaled arbitrarily.
- igi
- The 'igi' task is an interactive interpreter for producing arbitrary plots. The syntax of the commands is based on Mongo, but 'igi' operates within IRAF and is device independent. (A complete reference manual for 'igi' is available on request from the ST4GEM group.)
- newcont
- The 'newcont' task is an improved version of 'plot.contour'. The algorithm used produces smoother contours that will not cross. It also provides more options for determining contour level and specifying contour line types.
- rdsiaf
- The 'rdsiaf' task reads in the aperture descriptions from the Project Data Base (PDB) Science Instrument Aperture File (SIAF) and writes them into an SDAS table. This table is used by siaper, which plots the telescope apertures.
- siaper
- The 'siaper' task uses any graphics device to draw the science instrument apertures of the HST. It requires an input image containing WCS information. The drawn aperture can then be laid over an image.
- psikern
- The 'psikern' task is a GIO kernel that translates from IRAF's graphics to PostScript.