rick reynolds wrote:

> This is a little different from just talking about where data
> is located in space. To know the bounding box of coordinates
> (say between 80R and 80L, 83.1A and 79P, and 70I and 90S, for
> example) still leaves 48 choices for how it is oriented. The
> x-axis can start from any of the 6 faces of the box say,
> RLAPIS,
> leaving 4 choices for y and 2 for z.

But don't the signs of the elements in DELTA disambiguate this? Depending on the sign of a term in DELTA, I can tell which 'end' of the data for that dimension appears first in a file. If the first term of DELTA is positive, does it imply that the pattern (RLAPIS or whatever) must be RL rather than LR, or AP rather than PA, or IS rather than SI?

-Joel