The yields are normalized to charge, electronic efficiency, computer dead time, prescale factor.  No boiling correction was applied, but that shouldn't affect the solid targets.
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Additionally, all the yields for a given target and setting were normalized so that they're all on the same plot (and around 1, to easier see the problem).
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Carbon at 40 degrees, lowest setting, seems fine:
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<img src="http://www.jlab.org/~fomin/aug2008/dummy_subtraction/carbon_40_1140.gif" width=700>
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All settings at 18 degrees for carbon and dummy:
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<img src="http://www.jlab.org/~fomin/aug2008/dummy_subtraction/carbon_18_all.gif" width=700>
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<img src="http://www.jlab.org/~fomin/aug2008/dummy_subtraction/ald_18_all.gif" width=700>
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Highest setting at 18 degrees, helii, dummy, and carbon.  
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<img src="http://www.jlab.org/~fomin/aug2008/dummy_subtraction/yield_18_sample.gif" width=700>
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For reference, here are the relative thicknesses of dummy/cell walls:
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Hydrogen  - 7.557<br>
Deuterium - 7.614<br>
Helium-3  - 7.557<br>
Helium-4  - 6.896 <br>


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<span class ="head"><font size =+2>Dummy: closer look</font></span>
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Moved to <a href="http://www.jlab.org/~fomin/aug2008/dummy_subtraction/dummy.html"> here </a>.
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<span class ="head"><font size =+2>Helium-3: closer look</font></span>
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<br>
Moved to <a href="http://www.jlab.org/~fomin/aug2008/dummy_subtraction/he3.html"> here </a>.
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Return to original <a href="http://www.jlab.org/~fomin/aug2008/dummy_subtraction/">page </a>