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I posted the full extent of this question to Nabble, but essentially I'm having difficulty determining the route cause of the "unexpected string constant" error in the zp2ssg2.R (which I'm trying to port over from Octave). Here is my current Nabble posting: http://n2.nabble.com/Need-help-solving-the-unexpected-string-constant-error-td4077984.html Thanks for any insights and