Measured off-axis transmission (black points) of the AGPM and the exponential fit (red line) to the data as a function of radial distance from the AGPM centre in resolution elements. The data of both stars are combined after normalising the stellar fluxes (see text for explanation). The error bars of the flux measurements are smaller than the size of the symbols. The exponential fit on simulated data by Mawet et al. (2005) is shown as a dashed grey line for comparison.
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