extracting a serie of graphs (x,y) with a constant p value from a (p,x,y) table: RGetGraphSeries
extracting a serie of 2D lines (x,y) or 3D lines (x,y,z) with a constant p value from a (p,x,y) or a (p,x,y,z) table: (p,x,y) tables: RGetPolyLineSeries et RGetPolyLine3DSeries