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1 Preface

Version 4.0 of the ISOPHOT IDUM should provide all information necessary to understand the ISOPHOT data products as processed by off-line processing (OLP) version 7. Besides OLP software and product specific details, background information is provided about the ISOPHOT instrument itself, signal processing steps, and photometric calibration issues.

Although it has been tried to give as complete as possible ISOPHOT related information, it should be stressed that this manual is not intended for interactive data analysis. For specific algorithms to process and improve the results interactively we refer to the ISOPHOT Interactive Users Manual [9].

We have included cross references in the text wherever possible in view of the fact that a version of this document is also available in HTML.

Version 4.1 includes corrections of errors and omissions mainly spotted by Dr. Y. Sato who performed a thorough reading of the document.

The Authors