How do I change starting baseline of the MRTG Graph.

I would like to change the starting baseline for my MRTG graph. Here is what I am trying to do. I am using
unscaled[_]:and maxbytes[_]:180 to monitor the voltage on my UPS and I want to set the starting baseline
at 100 and ending baseline at 180. 

Currently the graph shows from 0 to 180. 

Thanks in advance for your help.

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