 be specified.
  </li>
  <li>If Baseline TF settings are specified, then Hyperbolic TF settings
      are not permitted, and vice versa. (The settings specified will 
      determine whether <a href="http://lucene.apache.org/core/5_1_0/misc/org/apache/lucene/misc/SweetSpotSimilarity.html?is-external=true#baselineTf(float)" title="class or interface in org.apache.lucene.misc"><code>SweetSpotSimilarity.baselineTf(float)</code></a> or
      <a href="http://lucene.apache.org/core/5_1_0/misc/org/apache/lucene/mi