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:  • Enter only positive values (greater than zero) in the cells used to create the chart. • In the chart, click the axis you want to change. On the Format menu, click Selected Axis. Click the Scale tab, and then clear the Logarithmic Scale check box.