Problem stsetch 2001-07-21 16:51:29: backside cooling seems poor

ericp at ericp at
Sat Jul 21 04:51:30 PDT 2001

I processed 5 wafers last week through the exact same 
litho process, and etched 3 of them  last week with 
no problem.  This week, I attempted to etch the other 
two, and the resist burned off very early.  Also, I noticed
the He FLOW was a little unstable, though hovering around 
2.7-3.0.  Would a bad lip seal cause this problem?  

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