## Configuration and Initialisation Files.

The “hardware” configuration of the interferometer is listed in several files:

- INTER_BASE:CONFIG.DAT
  This file indicates some basic array parameters, specially the time corrections. It should never be changed by operators or astronomers.
- INTER_BASE:GENERAL.ANk
  These files contain antenna dependant parameters, such as pointing constants, focus and homology parameters. The parameters change only when the antenna is repaired or modified.
- INTER_BASE:Tij.ANk
  These files contain parameters for antenna k on station Tij (e.g. W00, not W0): IAZ, MVE, MVN, position errors dX,dY,dZ and delay offset. They have to be updated each time the antenna is set on station.
- INTER_BASE:START.OBS
  This procedure indicates on which stations the antennas are currently located, and to which correlator entries they are connected. It also indicates which is the antenna connected to the single-dish backends.

A special language in OBS has been implemented to allow modifications of the array configuration parameters: language SET, which is available only in the CONFIGURE mode. These files should never be modified by a text editor.

The acquisition programs RED and RDI write the data on files named INTER_DATA:Date.BUR and INTER_DATA:Date.IPB respectively, where Date is the current date in the form DD-mmm-YYYY. Three log files are created, Date.LOG-OBS by OBS Date.LOG-RED by RED and Date.LOG-RDI by RDI, in directory INTER_LOG.