## Overview

MRTCAL offers 2 main tasks:

- indexing the IMB-FITS files,
- calibrating the IMB-FITS files.

Indexing is done by creating a database of the IMB-FITS. This offers several advantages (e.g. opening the IMB-FITS - which is usually slow - is factorized once at indexing time) and flexibility (e.g. the user can select the desired subset of IMB-FITS files). The command to be used for this task is INDEX (see HELP for details), and the database is usually named index.mrt and saved together with the IMB-FITS files.

Calibration of the IMB-FITS files has 2 major modes: per file (command CALIBRATE), and for Current indeX (command PIPELINE). The pipeline mode is an automated way to calibrate each the files in the Current indeX, selecting the calibration scans, etc.

In addition, MRTCAL offers a collection of tuning options with the command MSETUP. For a first approach, you may be interested in the groups MSETUP CALIBRATION (i.e. tune the way the calibration is performed) and MSETUP OUTPUT (i.e. what results and how they are saved in the CLASS file). See dedicated HELP for exhaustive description.