**Table 2:** Column 1: observed field; Col. 2: coordinates (2000); Col. 3: R exposure time; Col. 4: B exposure time; Col. 5: E(B-V) following Schlegel et al. (1998).
Field	Coordinates (2000)	R	B	E(B-V)
RX J1119	11 19 43.7, 21 26 50	4500 s	10 800 s	0.021 $\pm$ 0.001
C1	23 40 41.6, 15 07 11	4500 s	10 800 s	0.026 $\pm$ 0.001
C2	01 08 02.1, 12 56 27	3600 s	9720 s	0.019 $\pm$ 0.002
C3	02 25 49.3, 02 09 45	3240 s	8400 s	0.026 $\pm$ 0.001

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