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Fig. A.1


Completeness contours for KS = 17 in the neighborhood of the Trapezium stars. The contours represent the 10%, 30%, 50%, 70% and 90% levels with increasing distance from the inner cluster respectively. This figure shows that the iso-sensitivity contours roughly follow the iso-brightness levels of the image, indicating that the completeness of the survey is strongly affected by the background nebular emission.

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