def update_gasp_table(tt):
    """Modifies the following gasp table fields:
          1) rangeMaxPPEM changed to 65535
          2) rangeGaspBehavior changed to bit mask 0b1111 = 15"""
    if tt['gasp'].gaspRange != {(65535): 15}:
        tt['gasp'].gaspRange = {(65535): 15}
        return True
    else:
        return False
