def synergy_rows_list(ws, signal_names):
    """
    Params
    - ws: openpyxl worksheet object
    - signal_names: name given to the signal by the user, i.e., "CFP"
    Returns
    - rows: list of tuples, each containing ('signal', signal_row_position)
    """
    rows = [(celda.value, celda.row)
                  for celda in ws['A']
                  if celda.value in signal_names]
    return rows