code: public List<String> getTableColumn(final By tableBy, final int columnNumber) {
  		List<String> result = new ArrayList<String>();
  		List<List<String>> table = this.getTableAsList(tableBy);
  
  		for (List<String> line : table) {
  			result.add(line.get(columnNumber));
  		}
  		return result;
  	}
docs: Returns the values for a specific column from a HTML table.
  
  @param tableBy
  the way to identify the table
  @param columnNumber
  the column number
  @return a list with all the values corresponding to the specified column