code: def getExpressionLevels(
              self, threshold=0.0, names=[], startIndex=0, maxResults=0):
          
          rnaQuantificationId = self.getLocalId()
          with self._db as dataSource:
              expressionsReturned = dataSource.searchExpressionLevelsInDb(
                  rnaQuantificationId,
                  names=names,
                  threshold=threshold,
                  startIndex=startIndex,
                  maxResults=maxResults)
              expressionLevels = [
                  SqliteExpressionLevel(self, expressionEntry) for
                  expressionEntry in expressionsReturned]
              return expressionLevels
docs: Returns the list of ExpressionLevels in this RNA Quantification.