Before changing we check how much we cut with the ESR scrapers
two lines
208Pb80+ with slits intensity 15 arb u
204Hg78+ ... 0.055

Now, slits fully open


208Pb80+ with slits intensity 127 arb u
204Hg78+ ... 0.25

Increase compared to 188Hf measurement:
208Pb80+  increase of factor 8.5
204Hg78+  increase of factor 14