title: Extracting data with NCO bounded by variable values
body: <p>Is it possible to pull out all data within a region (or specific cells) that meet criteria set by a variable rather than a dimension?</p>
  
  <p>For example, I'm looking to pull data within a height ('HGT') bounded region.</p>
  
  <p>Hyperslabbing seems to requires dimension rather than variable.</p>