<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi,<div><span class="Apple-tab-span" style="white-space:pre"> </span>This in context of using Chimera to view *ccp4 format electron density maps. How does Chimera 'Threshold Level' ('Level' in Volume viewer) equate or relate to sigma level reported by some other programs. For example a 'Level' of 0.4 seems like a map contoured at 1.5 sigma or so. </div><div><span class="Apple-tab-span" style="white-space:pre"> </span>I was wondering if someone could point out how these two are related, more precisely.</div><div><br></div><div>Thanks<br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="font-size: 10px; "><br class="Apple-interchange-newline">Veer Sandeep Bhatt</span></span> </div><br></div></body></html>