Logarithmic Scale displays the y-axis with a log scale. Setting the value to a number, such as 10, displays the scale with tick marks at 1, 10, 100, 1000, etc. intervals. With Logarithmic Scale, Tick Mark Density works differently. When Logarithmic Scale is 10, and the Tick Mark Density is any value greater than 0, the chart displays minor tick marks between the major labeled tick marks.