Contents

• 1. Introduction
  • 1.1 Overview
  • 1.2 History
  • 1.3 Calibration Information
  • 1.4 Caveat Emptor
  • 1.5 Installation
  • 1.6 Reporting problems
  
  
• 2. Getting Started
  • 2.1 Command
  • 2.2 Data
  • 2.3 Coordinates and Overlays
  
  
• 3. Plot Images
  • 3.1 Displaying
  • 3.2 Color
  • 3.3 Image Placement
  
  
• 4. Source analysis
  • 4.1 Background
  • 4.2 Sosta
  • 4.3 Counts
  • 4.4 Detect
  • 4.5 Remove
  • 4.6 Extract
  • 4.7 PSF
  
  
• 5. Mosaics
  • 5.1 Without Exposure Maps
  • 5.2 With Exposure Maps
  
  
• 6. Commands A-F
  • 6.1 alias - rename a command string
  • 6.2 background - calculate average image background
  • 6.3 bglevels - calculate background levels
  • 6.4 boxreg - select a box region
  • 6.5 cct - change color table
  • 6.6 centroid - calculate centroid
  • 6.7 cey - change the equinox
  • 6.8 chheader - change header information
  • 6.9 chmdb - change mission information
  • 6.10 circlereg - select a circular region
  • 6.11 close_pg_window - close the pgplot device
  • 6.12 colors - display and modify available colors
  • 6.13 contour - display iso-intensity contour levels
  • 6.14 coord - coordinate conversions
  • 6.15 ccorr - coordinate correction based guide sources
  • 6.16 counts - sum counts in a given area
  • 6.17 cpd - change plot device
  • 6.18 crop - crop image
  • 6.19 curve - draw curve between two sky positions
  • 6.20 detect - source detection
  • 6.21 display - display the current image
  • 6.22 draw - draw shapes
  • 6.23 excess - find excesses
  • 6.24 exit - quit
  • 6.25 extract - extract a spectrum or lightcurve
  • 6.26 finding_chart - query STScI DSS for image
  • 6.27 flip - flips image array
  • 6.28 free_saved - free the saved image
  
  
• 7. Commands G-R
  • 7.1 gencolor - generate color image from event file
  • 7.2 grid - overlay a sky coordinate grid
  • 7.3 header - display header summary
  • 7.4 help - ximage help
  • 7.5 hotspot - show position of EXOSAT CMA hot spot
  • 7.6 iminfo - text overlay
  • 7.7 label - write labels on the image
  • 7.8 levels - manipulate intensity levels
  • 7.9 log - open a log file
  • 7.10 map - manipulate image maps
  • 7.11 marith - perform arithmetic with image maps
  • 7.12 moper - perform mathematical operation between image maps
  • 7.13 offset - calculate offset
  • 7.14 pcontour - core contour plotting
  • 7.15 pimage - core image plotting
  • 7.16 pixel_to_ra_dec - convert pixel to sky coordinates
  • 7.17 powplot - start POWplot viewer
  • 7.18 prarray - print Tcl array to screen or file
  • 7.19 psf - estimate the point spread function
  • 7.20 ra_dec_to_pixel - sky to detector coordinates
  • 7.21 rdarray - read text file into Tcl array
  • 7.22 read_image - read an image or events files
  • 7.23 rebin - rebin the current image
  • 7.24 recall - recall past command
  • 7.25 remap - remap image to new coordinates
  • 7.26 remove_sources - remove sources
  • 7.27 rescale - rescale the current image
  • 7.28 resize - change the pixels size of the current image
  • 7.29 restore_image - restore the saved image
  • 7.30 rotate - rotate the current image
  
  
• 8. Commands S-Z
  • 8.1 saoimage - Start the SAOIMAGE display package
  • 8.2 save_image - save the current image in memory
  • 8.3 scale - plot color scale
  • 8.4 screengrab - capture /xtk plot
  • 8.5 script - write a command script
  • 8.6 search - slide-cell search
  • 8.7 select - cursor selection
  • 8.8 show - current ximage status
  • 8.9 skymap - overlay a star chart
  • 8.10 skyview - retrieve an image from skyview
  • 8.11 slice - draw an x or y slice of the image
  • 8.12 smc - minimum display level
  • 8.13 smooth - gaussian image smoothing
  • 8.14 sosta - source statistics
  • 8.15 srcmrg - merge detect output files
  • 8.16 sum_images - add the saved and current images
  • 8.17 surface - plot a surface based on the current image
  • 8.18 syscall - spawn system call
  • 8.19 timestamp - plot time/user info
  • 8.20 title - set an image title
  • 8.21 uplimit - calculate upper limit
  • 8.22 value - print data value
  • 8.23 viewport - set viewport
  • 8.24 vignetting - correct exposure map for vignetting
  • 8.25 vplabel - write label with respect to viewport
  • 8.26 wcs - monitor and manipulate wcs coordinate data
  • 8.27 write_image - write the current image to a file
  
  
• 9. Data formats
  • 9.1 Input
  • 9.2 Output
  • 9.3 Ximage-Specific Files