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Fig. 4.

image

Superposition of all calibration stars observed during one night used to compute distortion parameters for the St Lupicin, Sutrieu, and Lignan cameras (from top to bottom). X and Y are the positions of the stars in the images (pixel). Errors between the distortion model and measurements are represented by a colour scale (arcmin). The positions of the meteor of 2017-08-04 UT 00:06 are shown in dark blue.

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