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Explanation: Not sure, really, but your phrase seems to be concerned with how the diagram or figure is depicting the upper "Riegel" -in other words, the reader should not assume that the proportions or distance between two objects are an accurate representation of how it will be once installed / assembled etc. That's why I first thought in terms of "according to scale."
2nd-ly, it could just mean that is NOT where the "measuring point" is, or starts from. That seems to make even more sense. But you have the picture, not me.
Maybe this is why a qualified contact person or the author's details are always so helpful in our business.
Matthew Harris Germany Local time: 18:16 Native speaker of: English PRO pts in pair: 88