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: http://www.atnf.csiro.au/computing/software/spc/node2.html
Дата изменения: Unknown Дата индексирования: Tue Oct 2 11:32:49 2012 Кодировка: Поисковые слова: south pole |
SPC was originally written to process data written by SPECTRA, the spectral-line observing program of the Parkes radiotelescope. While SPC's data structure and many of its commands are Parkes-specific it has been adapted for use by a variety of other telescopes (e.g. the AT, Nobeyama). The latest version recognizes a number of data formats; the the original .SPC files still written by SPECTRA, RPFITS format data files written by the AT correlator, Single-dish FITS (SDFITS) files written by various utilities, including SPC itself, and the old memory-dump format produced by SPC(the .SAV files which may no longer be written).
The basic idea in using SPC is to load in a sequence of up to 110 spectra and then use various commands to operate on these spectra. The locations available in memory for holding spectra are referred to as registers. Some operations involve using a reference spectrum, for example, forming quotient spectra from a series of signal spectra and a reference. Register 111 is conventionally reserved for the reference spectrum. Reduced spectra may be written to a disk file (WRITE) for storage in single-dish FITS format. These SDF files can be read again into SPC for further processing. SPC registers may be appended to an existing SDF file thereby providing a convenient way of organizing spectral data.
SPC commands are minimum-match; i.e. the shortest unambiguous abbreviation (usually two letters) may be used. A brief list of the most often-used commands occur with the command prompt; the complete list is given in this document. Since the interactive format is question and answer, which can be a lengthy process, a shorter form of the command (ending in a period) may be used. This skips many of the questions, using the previous answer as the default. Previous answers are (almost) always kept as defaults for both full and short forms of a command.
Brief history:
The SPC distribution kit is available from the ATNF (Australia Telescope National Facility) web page, .
This document is composed of four parts: