Oddness in XTdb graph

[Rob Lewis]

My hourly script contains this: 

 turnon "Unit 1" in (2 * minutes) for (2 * minutes) 

 turnon "Unit 2" in (4 * minutes + 15) for (2 * minutes)

I haven't clocked them to verify that both units stay on for exactly 2
minutes, but in my XTdb graph, the digital "on" bar for Unit 2 is
consistently around 40% wider than the bar for Unit 1. They're different
colors, but both are "filled when ON" and set for 40% opacity. 


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