I am trying to do a Sola Solid line shape analysis using Topspin NMR software in order to obtain some kinetic data from a VT-NMR experiment.

However, I can not fit the curve.

I keyed in Solaguide then the window appeared (attached file). However, when I click to choose "Enter" to start analysis, then it showed error, saying not available in the current mode, and need to key in .ret. But .ret command didnt help.

Please advise. Thank you!

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