Keywords: clic

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### Calibration

The goal of the calibration is to estimate and correct for the instrumental gain in order to have an unbiased estimate of the true visibilities. We use a simplified version of the radio-interferometry measurement equation. The (complex) visibility measured on the baseline from antenna to antenna at frequency channel is related to the true object visibility by

| (1)

where and are the spatial frequencies corresponding to baseline at time and frequency , and we assume the object has a flat spectrum. Calibrating the data is computing the complex ``calibration curves'' and .