Our image contains, in pixel size, a region of of SMC. The scanning pixel size of a Super-COSMOS measuring machine is 10 and the plate scale is . Our image with center and contains a region of of SMC (Fig. 1).
The saturation limit of the plate has a density value of 2.2. This means that for the pixels having negative decimal logarithm of density value greater than 2.2, we have non-linear distortion of density-intensity plate diagram. The magnitude limit for classifying the spectra of our plate is mB=18.5.
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