Obviously not the result of a spectro measurement.

No! Because that methodology is FLAWED as would be the conclusions from it.

You don't appear to wish to tell us what Spectrophotometer you're using but I well. Here's the same target scanned twice on an i1 iSis XL:

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dE Report

Number of Samples: 1728

Delta-E Formula dE2000

Overall - (1728 colors)

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Average dE: 0.25

Max dE: 0.75

Min dE: 0.01

StdDev dE: 0.12

Best 90% - (1554 colors)

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Average dE: 0.22

Max dE: 0.41

Min dE: 0.01

StdDev dE: 0.10

Worst 10% - (174 colors)

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Average dE: 0.49

Max dE: 0.75

Min dE: 0.42

StdDev dE: 0.06

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That's noise in the data you don't have to introduce to see the differences in two RelCol results!

Now look at the dE differences measuring the same target with two different iSis XL's one being a Rev C and one a Rev E:

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dE Report

Number of Samples: 1485

Delta-E Formula dE2000

Overall - (1485 colors)

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Average dE: 0.71

Max dE: 1.81

Min dE: 0.02

StdDev dE: 0.30

Best 90% - (1336 colors)

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Average dE: 0.65

Max dE: 1.14

Min dE: 0.02

StdDev dE: 0.24

Worst 10% - (149 colors)

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Average dE: 1.29

Max dE: 1.81

Min dE: 1.14

StdDev dE: 0.13

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Now examine what I just illustrated correctly: sRGB, a mere 24 patches of a MacBeth, run through two profiles with identical measured spectral data and a dE reported without any such Spectrophotometer noise or differences. A max dE of 3. Not egregious but enough to put the myth that:

*AtoB1 tables are supposed to accurately colorimetrically represent the printed color. ***Always**, doesn't hold any value Colorimetrically!