SET CALIBATION

                  SET                                            CALIBRATION
    AUTO|MANUAL|NONE|TREC|HUMIDITY|ON|OFF|INTERVAL  argument  /ANTENNA  Iant
    /RECEIVER Irec

         Defines the calibration mode
    NONE:     uncalibrated spectra & data
    MANUAL:   Manual guess of atmospheric transmission
    AUTO:     fix Water to argument (in mm), compute Trec
    TREC:     fix Trec to argument (in K), compute Water
    HUMIDITY: estimate water from umidity ant temperature
    OFF:      temporarily disable atmospheric calibration
    ON:       Restore caibration in previous mode
    INTERVAL: Interval between two measurements of ambient load (in hours)