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The "Definition of the S-Coordinate for graphical plots along the LCLS beamline", is at http://www-ssrl.slac.stanford.edu/lcls/prd/1.1-103-r0.pdf^{Image Removed}

The SUML is the beam path length (as the "crow" flies), including all
curves and bumps along the way.

...

These coordinates are described in an LCLS tech note at:

http://www-ssrl.slac.stanford.edu/lcls/technotes/lcls-tn-03-8.pdf^{Image Removed}

The length of a device is included in the EXCEL MAD-output file...

http://www-ssrl.slac.stanford.edu/lcls/linac/optics/lcls.xls^{Image Removed}

...under column "F", called "L_EFF". For magnets, this is the magnetic
length, not the physical length.

...

The "LCLS" Z-coordinate is used in the "LTU" EXCEL file at:

http://www-ssrl.slac.stanford.edu/lcls/linac/optics/ltu.xls^{Image Removed}

The index page with links to these EXCEL files notes which coordinates
are used ("linac" or "LCLS"):

See http://www-ssrl.slac.stanford.edu/lcls/linac/optics/^{Image Removed}.

I know it's a bit much, but that's the story.