Chart Catagory Axis Max. characters?

[jempc]

I am trying to chart " Head Loss" thru a valve body, however, as I get up in gallons/min. It will not let me go over three characters.

I need it to be 900, 1000, 1100, 1200 etc..., not 900, 100,110 etc...


I attached I picture as an example.

Any help, would be great.


Thanks
Jay