<total number of volumes> <volume number>
Comment: In the original NASA-Ames specification, is it possible to spread a dataset over several files to reduce the size of each individual file. The numbers in line 6 indicate the total number of volumes for the present dataset and the volume number of this file, separated by a space. Both numbers are not actively used here, fixed to 1, but kept for being backwards compatible and conforming with the NASA-Ames specification.
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