Hello Barry,

the numbers for x,y,z ... are the positions of the values in the file. x=0,y=1 ... . -1 means no Evaluation. If you have a file with comments, then you can choose from which Position the file should be parsed - S Phrase -> start Phrase | E Phrase end Phrase.

I think the Problem is in the curve node you have used -> Switch from curve to Interpcurve in the info Panel.

Hope that helps!

Have a nice day
Karsten