FYI for anyone interested, I got a iso-luminant (same brightness all across) image of the color gamut in HSL space, and took a photo of it with Fuji HR-U green xray film
Then lined up the spectrum image with the photo (adjusted to control black and white card points I included as well) and graphed out the sensitivity of the film by sample points, using the lightness of the B&W HR-U scanned negative
So I believe this is pretty much the spectral curve of HR-U, unless you know something I did wrong. I ordered some RX-N, I will do that one too later.
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