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: http://www.sao.ru/precise/Midas_doc/doc/94NOV/vol2/node150.html
Дата изменения: Fri Feb 23 14:01:46 1996 Дата индексирования: Tue Oct 2 18:28:45 2012 Кодировка: Поисковые слова: viking 2 |
A frequently used procedure, alternative to the correction for the chromatic response, is to normalise the continuum to unity by dividing the observed spectrum by a smooth approximation of its continuum. This approximation can be obtained either interactively with the graphic cursor, or from a table (command NORMALIZE/SPECTRUM) or by dividing the raw data by itself after filtering or smoothing. Median filtering and running average algorithms are well suited for this purpose (command FILTER). A spline fit can be made to the points defined interactively as well as to the filtered data (command CONVERT/TABLE). The MIDAS Fitting Package permits to go further and perform a more advanced modelling of the continuum.