Handling error images Clause Samples

Handling error images. In order to follow in detail the error propagation throughout the reduction process, REDUCEME programs which perform arithmetical manipulations can also translate the effect of such manipulations in associated error files. For this purpose, an error file can be created for each data image in an early stage of the reduction process. From that point, most of the programs will be executed simultaneously with data and error files (if this is the user’s wish). REDUCEME programs assume that error files are named in the same way than the normal data files, but with an additional “e” character between the portion of the file name preceding the last period (if present) and the last period itself. If no period is present in the file name, the character “e” is assumed to be the last character of the complete file name. Some examples are data file name assumed error file name file001 file001e file398_xi.biased file398_xie.biased file001.new.u file001.newe.u Anyway, it is important to note that this convention is not mandatory, and error file names can be chosen arbitrarily (although in this last case, the default values for the error files will not be of any use).