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Appendix A: SABOCA and LABOCA submillimeter maps

	Figure A.1: Full submillimeter maps. Left: SABOCA, displayed at the original resolution of 7 8; right: LABOCA. Protostars in the field are labeled with their HOPS designations. For both maps a logarithmic color scale is used.
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Appendix B: PANIC H and K photometry

Table B.1:   PANIC NGC 1999 near-IR colors of background stars.

Five faint stars are visible in the PANIC H and images. Their positions and photometry are listed in Table B.1. Photometric calibration was performed with 2MASS photometry of comparison fields containing 20 2MASS sources and verified with a 2MASS star in the science field. Photometry was conducted with the IRAF task apphot.

The measured color was used to estimate the extinction A_V toward the stars. We assumed an intrinsic color of 0.17, derived as the median colors of stars in an unreddened control field near Orion (Megeath et al., in prep). We adopted the reddening law of Indebetouw et al. (2005) to convert excess into K-band extinction A_K, from which we obtained the optical extinction as , corresponding to a total to selective extinction R_V between the diffuse ISM value of 3.1 and the higher values (up to 5) found for dense clouds (e.g. Campeggio et al. 2007).