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I am trying to plot the PCA loadings vs spectra. So far I can retrieve the PCA coordinates per observation. In a manual, I saw there was a widget called curves to do this. It does exactly what I need but it seems impossible to find it.

Thank you

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That widget was replaced with one called "Spectra". You can find it in the orange-spectroscopy add-on or in the Quasar distribution.

To install the add-on in an existing installation, go to the menu "Options" / "Add-ons..." and check the box next to "Spectroscopy".

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