A: The row colours reflect the current setting from the Column Properties dialog eg. black are text fields, blue rows are numeric columns.  Green rows are numeric columns which have been “aliased” to standard geochemical names so they can be used with the supplied calculations, classification diagrams and spider plots.  When the dataset contains columns that have been produced as a result of a calculation within ioGAS then these will appear as dark blue or dark green numeric columns depending on whether the input columns were “aliased”.  The colours will help in selecting appropriate variables for your plots.