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D. J. DREWRY: In view of the roughness of the terrain that you sounded, did you deconvolute the radio-echo records?
W. F. BUDD: NO. So far we have only been concerned with the large-scale smooth contours to prepare the preliminary maps. For these deconvolution is not necessary.
W. F. WEEKS: Were your glacier velocities determined by radio-echo fading patterns?
BUDD: No, they were obtained by standard tellurometric surveying.
G. DE Q. ROBIN: Your earlier maps showed that the basal ice temperature was at the pressure melting point over wide areas near the coasts of Antarctica. Would you agree that it now appears that ice rises and ice that is slowly moving are likely to be frozen at the base, and that the pressure melting point is only to be attained under the more rapidly moving ice streams?
BUDD: Yes. Those early Antarctic basal temperature maps are derived from a low density of data points and in most cases smooth over the small-scale coastal irregularities. However, there is still the general trend for the basal temperatures to increase towards the pressure melting point when approaching the coast and the inland boundaries of the major ice shelves.
C. W. M. SWITHINBANK: We would all welcome having the basal temperature maps brought up to date so that we know where to go to study sliding velocities by the technique of matching fading patterns of radio echoes.