The following dialog is displayed after the Grid parameters tab is selected in the Diagrams - properties dialog. 
The options in this dialog let you determine the parameters of an auxiliary grid for X and Y axes shown on diagrams: 
- Logarithmic scale - Turns on/off the logarithmic scale for a given axis. 
 
- Main lines - Turns on/off the presentation of grid main axes on diagrams. 
 
- Number of main lines - Determines the number of main lines presented on diagrams. 
 
- Intermediate lines - Turns on/off the presentation of grid intermediate axes on diagrams. 
 
- Values on axis - Turns on/off the display of coordinate values on axes.