A:  In ioGAS version 4.5 or later, you can create XY Diagram with log scale axis by going to Diagrams>New logarithmic XY diagrams. In ioGAS version 4.4 and older, creating diagrams with a log scale axis is not supported.  As a workaround create logged columns for selected data variables first using the Quick Calculations>Log base 10 menu option and then create a new XY Diagram using these logged columns as the axes.