If a parameter is not received or if the value received is blank, then the value is cleared and the default offset will be used.
Changed:
< <
The offset is specified in axis scale units. For example, an offset of 50 means the tick is shifted 50 units along the axis.
> >
The offset is specified in axis scale units. For example, an offset of 50 means the tick is shifted 50 units along the axis while a value of .5 will shift the tick half of a scale unit.
By default, the ticks are center aligned with the labels. This subroutine is commonly used to shift the ticks to put them in between the labels.