[Plotting SI in Gtplot]

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[Plotting SI in Gtplot]

Dear GWB community,

I would like to plot SI for mineral saturation, rather than (Q/K).  My GSS spreadsheet is showing log (Q/K), but when I do an XY plot with "mineral saturation", Gtplot always uses (Q/K) rather than log (Q/K).  If I switch the scale to log, it does not transform the data, only the axis scale.

How can I plot SI (log (Q/K)) directly for mineral saturation using Gtplot?

I found a work-around by copy/pasting the log (Q/K) column calculated by GSS into a new user-defined analyte, but it would be better if SI could be plotted directly.

Thank you for your time and consideration.

Andy