Negative or zero values cannot be plotted correctly on log charts. Only positive values can be interpreted on a logarithmic ...

Negative or zero values cannot be plotted correctly on log charts. Only positive values can be interpreted on a logarithmic scale. To correct the problem, do one of the following:  • In the cells that were used to create the chart, enter only positive values (greater than zero). • In the chart, click the axis that you want to change, and then change the scaling option to something other than Log scale. (Options tab, Chart Elements group, Axes button).