Just left-click on the relevant line, and once highlighted the Y-axis will use the units relevant to that line value. There is also an "Optimize Scaling" button in the icon-based toolbar that will automatically adjust the Y-axis to make everything fit so lines aren't running off the top of the graph.
--
My book "Max Power: Check Point Firewall Performance Optimization"
now available via http://maxpowerfirewalls.com.
Gateway Performance Optimization R81.20 Course
now available at maxpowerfirewalls.com