.Lp
When the toggle button for "auto scale" is "ON", the axes labeling
will be "nice". That is if the user changes the Min or Max values, then
the interval is updated to a "nice" value. If the Interval is changed
then the Min and Max are updated to a "nice" value. Auto scale is 
recommended if the user desires nice axis labeling. 
.LP
When the toggle button for "auto scale" is "ON", the axes Min and
Max are set to the Min and Max of the data plotted. For the
first plot the interval is then calculated. After a plot has been 
drawn, the Minimum, Maximum and Interval are independent of
each other. That is, if the user changes the Interval, the Minimum
and Maximum will remain unchanged. The same holds true for the
Interval.
.LP
When specifing the Interval for a plot, the labels may not be drawn
because there is not enough room to label the axes without over lapping
other labels. To fix this problem, simply change the Interval to be a larger 
value. Note, the minimum and maximum value is always drawn.
