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can someone help, 
after the following command
prep -design &lt;design-name&gt;
it is seen that inside the tmp folder
[ OpenLane-&gt;designs-&gt;design-name-&gt;runs-&gt;RUN_Time_stamped_folder-&gt;tmp ]

there are mainly three files
merged. max. lef
merged. min. lef
merged. nom. lef

what's the difference between the above three files????

slow/fast/typical corner files. Default will use `merged.nom.lef` only.

Thanks for your answer. I tried opening using
merged.nom.lef and also merged.min.lef but klayout gives some error , but when used merged.max.lef it works

when used magic to open I see standard cells in left bottom corner after floorplan which is as expected   but klayout is not showing standard cells after floorplan plan despite opening def plus lef files

What is Linen?