Hi every one !

I need to know how to get permission to reuse some previous pictures for the next coming paper and different journal. I read some article in which some previous experimental setup pictures is republished with the permission of previous original author and copy right journal. 

If original previous author has no objection to republish his article picture then what is procedure ? Just agree on email or any letter head or signature required ?

How to deal or communicate with copy right journal ? because I did not find any simple link or heading to get permission. Please guide !!

SECOND QUESTION:

Second question is about DATA plotting. If we have our own results. Now we are comparing with previous graph. So that one graph line shows present study and other line shows previous study. I saw many practices to draw other authors line in the article. People just use a software to know the points of that line and plot it again.. Is it right.. ?

Please suggest.. 

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