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Fig. 6.


Dust de-reddened (J0660ins − r)0 vs. (g − i)0 colour–colour diagram. Dots are individual MS calibration stars. Upper panel: initial instrumental J0660 photometry. The solid line shows the linear fit to the data in the range 0.20 <  (g − i)0 <  1.25. Middle panel: J0660 photometry corrected with the offsets ΔJ0660atm. The red line shows the linear fit in the upper panel. Bottom panel: final instrumental stellar locus (red line) estimated as the median of the colour distribution in the range −0.5 <  (g − i)0 <  2.4. The final ΔJ0660atm were estimated with respect to this locus.

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