#4213 NORM First D: Two sliding lines needed to measure values

[Zarro Boogs per Child]

#4213: Two sliding lines needed to measure values
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 Reporter:  arjs            |       Owner:  arjs                  
     Type:  enhancement     |      Status:  new                   
 Priority:  normal          |   Milestone:  First Deployment, V1.0
Component:  distro          |     Version:                        
 Keywords:  lines, measure  |    Verified:  0                     
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 See attached file.

 The idea is to have two sliding lines that can help in measuring
 difference between two points on the graph either on the X Scale or on the
 Y Scale.

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Ticket URL: <https://dev.laptop.org/ticket/4213>
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