uring
certain times, see <code>--since</code> and <code>--until</code>.</p>
</dd>
<dt class="hdlist1"><em>&lt;refname&gt;@{&lt;n&gt;}</em>, e.g. <em>master@{1}</em></dt>
<dd>
<p>A ref followed by the suffix <em>@</em> with an ordinal specification
enclosed in a brace pair (e.g. <em>{1}</em>, <em>{15}</em>) specifies
the n-th prior value of that ref.  For example <em>master@{1}</em>
is the immediate prior value of <em>master</em> while <em>master@{5}</em>
is the 5th prior value of <em>master</em>. This suffi