Table 9: Optical and infrared photometry ( ${\it UBVJHK}$). Values for ${\it JHK}$ are from the 2MASS Point Source Catalogue (Cutri et al. 2003). The invariance of the infrared part of the extinction curve is utilised to compute $R{_{\rm V}}$ (Sect. 4.2). For all adopted methods we need colour excesses which can be derived using intrinsic colours for the corresponding spectral type, or by finding a spectral type match between the reddened and comparison target. Errors are 0.02, 0.02, and 0.04 for V, B-V, and U-B, respectively.
Target   V B-V U-B Source   J H K   Source
    (mag) (mag) (mag)     (mag) (mag) (mag)    
reddened stars:                
Sk -69 223   11.59 0.11 -0.73 1   11.285 $\pm$ 0.030 11.206 $\pm$ 0.033 11.108 $\pm$ 0.035   5
Sk -69 243   9.50 0.13 -0.75 1   9.428 $\pm$ 0.056 9.354 $\pm$ 0.083 8.927 $\pm$ 0.050   5
Sk -67 2   11.260 0.080 -0.690 4   11.019 $\pm$ 0.023 11.003 $\pm$ 0.024 10.917 $\pm$ 0.019   5
Sk -68 135   11.33 0.03 -0.92 3   11.233 $\pm$ 0.021 11.237 $\pm$ 0.025 11.165 $\pm$ 0.025   5
comparison stars:                
Sk -70 120   11.590 -0.060 -0.880 4   11.781 $\pm$ 0.022 11.801 $\pm$ 0.027 11.919 $\pm$ 0.036   5
Sk -67 5   11.340 -0.120 -0.950 4   11.578 $\pm$ 0.022 11.610 $\pm$ 0.024 11.619 $\pm$ 0.021   5
Sk -66 35   11.550 -0.070 -0.880 4   11.732 $\pm$ 0.027 11.725 $\pm$ 0.024 11.700 $\pm$ 0.034   9
Sk -65 15   12.140 -0.100 -0.920 4   12.420 $\pm$ 0.026 12.415 $\pm$ 0.024 12.420 $\pm$ 0.025   5
Sk -65 19   12.050 -0.080 -0.960 1   12.274 $\pm$ 0.024 12.308 $\pm$ 0.025 12.290 $\pm$ 0.026   5
Sk -65 41   12.820 -0.080 -0.810 1   13.049 $\pm$ 0.028 13.052 $\pm$ 0.030 13.054 $\pm$ 0.033   5
Sk -66 28   10.810 -0.150 - 1   11.816 $\pm$ 0.047 12.044 $\pm$ 0.058 11.765 $\pm$ 0.045   5
Sk -67 18   12.020 -0.220 -1.020 1   12.482 $\pm$ 0.029 12.553 $\pm$ 0.034 12.601 $\pm$ 0.039   5

[1] Feitzinger & Isserstedt (1983); [2] Isserstedt (1975); [3] Appenzeller (1972); [4] Gordon et al. (2003); [5] 2MASS (Cutri et al. 2003).

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