Erratum
Vo l. 35, No. 121 , p. 314, Fig. 4
The author has drawn a tte ntion to an error in the left-hand part of Figure 4. The following is the correct illustration
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Fig. 4. Altitudinal shift of the equilibrium line versus the gradient of annual accumulation for perturbations of air temperature δTa (left), absolute humidity δpv (center ) and annual accumulation δc (right ).