Sparky does not use the displayed orientation of the spectrum axes in
the view window to decide how to pair the spectrum axes when
overlaying. Instead it first checks if the nucleus types (H, C, N) are
the same for the w1 axes in both spectra, for the w2 axes in both
spectra, and the w3 axes for both spectra. In that case it simply
pairs w1 - w1, w2 - w2, w3 - w3 in the
overlay. Otherwise it tries to pair axes that have matching nucleus
types. For example if one spectrum had (w1 N, w2 C, w3 H) and you
overlay another with (w1 C, w2 H, w3 N) then it will pair the axes with
matching nuclei even though they are in different order. If this
mapping is not unique because two nuclei a identical, for example,
overlaying (w1 N, w2 H, w3 H) onto (w1 H, w2 N, w3 H) then I believe
Sparky just doesnt show the overlay. The only way to get that case to
work is to have the same nuclei for axes w1, w2 and w3. So youd need
to reorder the axes in your spectrum file. So basically Sparky wont
let you pair whichever axes you want, it uses a few fixed rules --
unfortunate.
Tom
hi Tom,
I noticed that if you overlay 2 3d spectra, both spectra are only shown
in the orientation of the spectrum that was present during setting the
overlay.
Is this intentional? or a bug?