This is the code for 3.6.8:
HTML Code:
<if condition="$show['avatar']">
<td><img src="$userinfo[avatarurl]" $userinfo[avatarsize] alt="<phrase 1="$userinfo[username]">$vbphrase[xs_avatar]</phrase>" border="0" style="border:1px solid $stylevar[tborder_bgcolor]; border-top:none" /></td>
<else />
<td> </td>
</if>
Searching for avatar in the memberinfo templates comes up with several hits, so I'm not sure which one to compare it to in there.