The top films at the North American box office

LOS ANGELES, Oct 20 (Reuters) - Following are the top 10 movies at North American box offices for the three days starting Oct 18, led by "Gravity," according to studio estimates compiled by Reuters. 1 (1) Gravity.............................$ 31.0 million 2 (2) Captain Phillips....................$ 17.3 million 3 (*) Carrie..............................$ 17.0 million 4 (3) Cloudy 2 ...........................$ 10.1 million 5 (*) Escape Plan.........................$ 9.8 milli