... The command CALIBRATE/LONG approximates the dispersion relation љ for each searched row of the arc spectrum. ... The mode GUESS allows a previously saved session to be used (command SAVE/LONG ) for the determination of the dispersion relation. ... The iterative identification loop consists of estimating the wavelength of all lines in the arc spectrum and associate them to laboratory wavelengths to refine the estimates of the dispersion relation. ...

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... This paper describes distortion calibration procedures for the SOHO /LASCO-C2 Coronagraph, based on in-orbit data and extensive image processing methods. ... C2 suffers from moderate optical distortion, which must be corrected in order to properly locate the stars crossing its field-of-view (which are subsequently used for photometric calibrations), to retrieve critical attitude parameters, and to insure a correct overlapping of the region common to the C2 and C3 instruments. ...

... Raw science 1 . ... The rootnames of the individual exposures in an associated data set are contained in the association file, which has suffix _asn (e.g., o3tt01010_ asn.fits ). ... The association table above tells the user that the product, or data set, will have the rootname o3tt01010, that there will be two science exposures contained in the o3tt01010_raw.fits file which are CRSPLITS, and that a o3tt01010_wav.fits file should exist containing the contemporaneously obtained automatic wavecal. ...

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