Table 2: Median and mean separation (and standard deviation) between Calar Alto (CA) coordinates and IRAS, MSX and VLA ones.
N $\Delta \alpha$ $\Delta \alpha$ ( $\sigma_{\Delta\alpha}$ ) $\Delta \delta$ $\Delta \delta$ ( $\sigma_{\Delta\delta}$ )

median mean median mean

CA-IRAS 363 3.1 $^{\prime\prime}$ 5.6 $^{\prime\prime}$ (7.1 $^{\prime\prime}$ ) 2.0 $^{\prime\prime}$ 2.3 $^{\prime\prime}$ (2.2 $^{\prime\prime}$ )

CA-MSX 243 1.4 $^{\prime\prime}$ 1.5 $^{\prime\prime}$ (1.4 $^{\prime\prime}$ ) 1.0 $^{\prime\prime}$ 1.3 $^{\prime\prime}$ (1.4 $^{\prime\prime}$ )

CA-VLA 44 1.0 $^{\prime\prime}$ 1.0 $^{\prime\prime}$ (0.8 $^{\prime\prime}$ ) 0.6 $^{\prime\prime}$ 1.1 $^{\prime\prime}$ (1.4 $^{\prime\prime}$ )

**Table 2:** Median and mean separation (and standard deviation) between Calar Alto (CA) coordinates and IRAS, MSX and VLA ones.
	N	$\Delta \alpha$	$\Delta \alpha$ ( $\sigma_{\Delta\alpha}$ )	$\Delta \delta$	$\Delta \delta$ ( $\sigma_{\Delta\delta}$ )
		median	mean	median	mean
CA-IRAS	363	3.1 $^{\prime\prime}$	5.6 $^{\prime\prime}$ (7.1 $^{\prime\prime}$ )	2.0 $^{\prime\prime}$	2.3 $^{\prime\prime}$ (2.2 $^{\prime\prime}$ )
CA-MSX	243	1.4 $^{\prime\prime}$	1.5 $^{\prime\prime}$ (1.4 $^{\prime\prime}$ )	1.0 $^{\prime\prime}$	1.3 $^{\prime\prime}$ (1.4 $^{\prime\prime}$ )
CA-VLA	44	1.0 $^{\prime\prime}$	1.0 $^{\prime\prime}$ (0.8 $^{\prime\prime}$ )	0.6 $^{\prime\prime}$	1.1 $^{\prime\prime}$ (1.4 $^{\prime\prime}$ )

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations and data reduction
	3 Identification of the optical/NIR counterparts
	4 Near infrared photometry
	5 Discussion
	6 Conclusions
	References
	Online Material