... VLT

Based on observations performed at the European Southern Observatory, Paranal, Chile (ESO Programme 67.D-0519).

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... telescope

See http://www.eso.org/instruments/fors/ for details on the instrument.

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...$R_{\rm s}$)

See http://www.eso.org/instruments/fors1/Filters/

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... coefficients

http://www.eso.org/observing/dfo/quality/FORS2/qc/photcoeff/photcoeffs_fors2.html

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