Table 2: Differential reddening $\Delta\mbox{$E(B-V)$ }$ in M 52.
$\Delta Y (\hbox{$^\prime$ })$ $\Leftarrow\Delta X (\hbox{$^\prime$ })\Rightarrow$  
$\Downarrow$ +15.0 +10.0 +5.0 0.0 -5.0 -10.0 -15.0 $\overline{\Delta\mbox{$E(B-V)$ }}$
+15.0 +0.22 +0.22 +0.06 +0.26 +0.29 +0.35 +0.13 $0.22\pm0.10$
+10.0 +0.11 +0.26 +0.24 +0.19 +0.16 +0.08 +0.11 $0.16\pm0.07$
+5.0 +0.05 +0.05 +0.11 +0.08 +0.18 +0.29 +0.21 $0.14\pm0.09$
 0.0 +0.08 -0.03 +0.05  0.00 -0.02 +0.35 +0.06 $0.07\pm0.13$
-5.0 +0.08 +0.08 +0.06 -0.06 +0.06 +0.10 +0.03 $0.05\pm0.05$
-10.0  0.00 -0.02 -0.06 +0.08 +0.06 +0.02 +0.11 $0.04\pm0.08$
-15.0 -0.03 -0.08 +0.03 +0.13 -0.05 0.06 -0.02 $0.01\pm0.07$
$\overline{\Delta\mbox{$E(B-V)$ }}$ $0.07\pm0.08$ $0.07\pm0.13$ $0.07\pm0.09$ $0.10\pm0.11$ $0.11\pm0.12$ $0.18\pm0.14$ $0.09\pm0.07$  


Notes. Uncertainties in $\Delta\mbox{$E(B-V)$ }$ are of the order of $\pm0.05$. For absolute values: $\mbox{$E(B-V)$ }=0.58+\Delta\mbox{$E(B-V)$ }$.


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