Measurement with preamplifiers after drying.

Amplifiers are brought back after ~12h and connected.
Measurement of background for 1hour
Online: 160720_1350_1452_Bkg.root
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There might have been a slight improvement on the PA behaviour
but is not clear.

Attached a screen shot of the spectrum

The spurious signals show very little noise superimposed
as can be seen in the attached capture of the sample by the DACQ
but is not so obvious how this can help to veto them.