They are the ratio of the T1w/T2w images and are a relative measure of myelin 
content.  See this publication for more details:

http://www.jneurosci.org/content/31/32/11597.short

Peace,

Matt.

From: 
<hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>>
 on behalf of Lisa Kramarenko 
<lisa.kramare...@gmail.com<mailto:lisa.kramare...@gmail.com>>
Date: Monday, May 29, 2017 at 5:29 AM
To: "hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>" 
<hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>>
Subject: [HCP-Users] values in myelin maps

Hello,

I am not sure what exactly are the values shown for the myelin maps. E.g. on 
the screenshot the values are 0.998 to 1.771. I understand that higher values 
mean higher myelination and vice versa, but what do they mean exactly?
Thanks!

Lisa

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