Could be. There's also a second sheet containing a more optimised version of the same program (fusing the two loops and eliminating the pointless array, so we just keep running track of the best value seen so far as we go along), and that has variables smx and smy for the x-coordinate and total length.
Hang on – as I typed that paragraph, I realise that "so far" is quite plausibly the "sf" part of the name: "smallest so far". That must be it.
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smxandsmyfor the x-coordinate and total length.Hang on – as I typed that paragraph, I realise that "so far" is quite plausibly the "sf" part of the name: "smallest so far". That must be it.