DPlot

I want import the data to DPlot in the format X1,y1,y2,X2,y1,y2, ... Xn,y1,y2 where n = 50 for example. This would produce two curves on an x,y plot, identically to a table of values where each x is a separate row, in which case I can import as XYYY.

There's no way to do that, sorry. You'll need to first edit your file with a text editor and insert carriage returns after every Y2.

Its OK, I'll stop looking. I'll just write an app to read the output and code DPlot into the app. It may be obvious, but there is more to this than one set of data. BTW, I have use DPlot as the graphical output in several applications used in my company. The primary reasons are 3D capability and the fact that when you save a plot all the underlying data are saved.