Heidelberg Plate Control Strip help

Hi.
I' m from Thailand. I can't find how to read meaning this zone on plate control strip when under or over developing or exposure.

Thank you for your kindness

 

In center it triangle should be merged.
If triangle is not merge in center then plate is either under develop/expose or over Delovped/expose depends which side triangle is merging

 

Thank you sir. Merge mean same as backgroud ? My picture is merge or unmerge? Please explain more again

 

Hi
In your picture, triangle is merged in second left.
It should be merged in center.

 

I see. Thank you very much sir.

 

Also note these stirps will work properly with prinect workflow.
If you are not using prinect workflow then it will never come