  <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
    <table class="ref-arguments">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>tac</th>
      <td><p>The time-activity curve data from tac_roi()</p></td>
    </tr>
    <tr>
      <th>SUVR_def</th>
      <td><p>a vector of start times for window to be used in SUVR</p></td>
    </tr>
    <tr>
      <th>ref</th>
      <td><p>a string, e.g. "cerebellum", to specify reference regi