The base offset into `data' at which the compressed data for this channel starts. @param chunkDataSize A 3-element array specifying the size of the volume. @param blockSize A 3-element array specifying the block size ued for compression. @param dataPosition A 3-element array specifying the position within the volume from which to read.
Stores the result in `out'.
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Reads the single value at the specified dataPosition in a single-channel compressed segmentation.