SetYTickLength
SetYTickLength — Set outer length of Y tick marks
Synopsis
$plot->SetYTickLength($yln)
    
Description
SetYTickLength sets the length of the Y tick marks
pointing outwards from the plot. For example, for tick marks on a Y axis
on the left side of the plot, this is the length from the axis to the left.
    
Parameters
- $yln
- 
Desired Y tick length in pixels.