public int findPosition(int i);
/**
- * Returns the from-to sequence positions (start..) for the given column
- * positions (1..), or null if no residues are included in the range
+ * Returns the sequence positions for first and last residues lying within the
+ * given column positions [fromColum,toColumn] (where columns are numbered
+ * from 1), or null if no residues are included in the range
*
* @param fromColum
+ * - first column base 1
* @param toColumn
+ * - last column, base 1
* @return
*/
- public Range findPositions(int fromColum, int toColumn);
+ public ContiguousI findPositions(int fromColum, int toColumn);
/**
* Returns an int array where indices correspond to each residue in the