The analysis of the data products and the raw data in FITS format can be performed using the XANADU and FTOOLS suite of programs.
Public domain software can be used to view the GIF files (e.g. xv on UNIX or directly from the Netscape browser on any Mac or PC).
General FITS file manipulation : The FTOOLS package, futils, provides a suite of programs that can be used to view and manipulate any of the Einstein archive files. To view the data particularly useful are the tasks fplot (to plot the data), fdump (to dump the data file content), fstruct and flcol (to get the structure and column name of the FITS files). Basic selection and column manipulation can be done using fselect (to select rows based on the result of a boolean expression), fcalc (to calculate values for new column based on arithmetic expression) and fstatistic (to compute standard statistical value on a column). Alternatively most of the operations (and more) mention above can be done using fv , the interactive FITS file viewer and editor.
High Level Data Products:
Images (HRI & IPC) There are several packages available to analyze FITS image files. The Ximage package will allow users to perform statistical analysis, source detection and various display options (contours, overlays, etc.) Fimage provides a set of general purpose image manipulation tools.
Spectra & Lightcurves (SSS & MPC)
Spectra and lightcurves can be analyzed using
Xspec is a general spectral fitting program, providing a number of already
made standard models. To use XSPEC with the Einstein archive files,
it is necessary to extract from the archive a source and background
spectrum and a response matrix.
Low Level Data Products:
The SSS and MPC raw data files can be analyzed using fplot and fsumrows . Fplot will allow up to 8 rows of a column to be displayed in a "stack". Fsumrows will allow any number of rows to be summed together and written to a FITS file. Fplot can then be used to display this file.
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Last modified: Tuesday, 12-Oct-2021 12:48:48 EDT