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.
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My book "Max Power: Check Point Firewall Performance Optimization"
now available via http://maxpowerfirewalls.com.
Attend my online "Be your Own TAC: Part Deux" CheckMates event
March 27th with sessions for both the EMEA and Americas time zones