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Hi Sneha,<br>
<br>
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<div class="WordSection1"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">One
more question- When does one use �add hydrogens� in
refinement? Does it help in the final stages of refinement?</span><br>
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<br>
this should answer your questions:<br>
<br>
"On contribution of hydrogen atoms to X-ray scattering"
<br>
<a class="moz-txt-link-freetext"
href="http://phenix-online.org/newsletter/CCN_2012_01.pdf">http://phenix-online.org/newsletter/CCN_2012_01.pdf</a>
<br>
<br>
Pavel<br>
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