<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br><div>Begin forwarded message:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>From: </b></span><span style="font-family:'Helvetica'; font-size:medium;">"Stephen A. Wood" <<a href="mailto:saw@jlab.org">saw@jlab.org</a>><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>Subject: </b></span><span style="font-family:'Helvetica'; font-size:medium;"><b>Systematic Errors</b><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>Date: </b></span><span style="font-family:'Helvetica'; font-size:medium;">May 10, 2013 1:52:08 PM EDT<br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>To: </b></span><span style="font-family:'Helvetica'; font-size:medium;">Patricia Solvignon-Slifer <<a href="mailto:solvigno@jlab.org">solvigno@jlab.org</a>><br></span></div><br><div>Patricia:<br><br>I think the table in Appendix B (page 29) of the Nuclear Dependence of R proposal might be a good guide of what time dependent/point to point systematic errors to consider in b1. Like b1, measuring R is essentially subtracting two cross sections to get a difference that is a small fraction of the cross sections. For b1, ignore the specific numbers presented. I believe the numbers in the table just get copied around between proposals and theses, and some of these systematic errors come from the fact that one has to change beam energies and spectrometer settings. But it would be worthwhile to think about each item in the list and consider whether it is relevant to b1 and how well it can be controlled.<br><br>Steve<br><br></div></blockquote></div></body></html>