Table:
text: Peter Thomson (golfer)
PGA Tour wins (6)
PGA Tour wins (6)
Date_ Tournament Winning_score Margin_of_victory Runners_up
9 Jul 1954 The Open Championship −9 (72-71-69-71=283) 1 stroke Bobby Locke , Dai Rees , Syd Scott
8 Jul 1955 The Open Championship −7 (71-68-70-72=281) 2 strokes John Fallon
4 Jun 1956 Texas International Open −13 (67-68-69-63=267) Playoff Cary Middlecoff , Gene Littler
6 Jul 1956 The Open Championship +2 (70-70-72-74=286) 3 strokes Flory Van Donck
4 Jul 1958 The Open Championship −6 (33-72-67-73=278) Playoff Dave Thomas
9 Jul 1965 The Open Championship −3 (74-68-72-71=285) 2 strokes Brian Huggett , Christy O`Connor Snr

Question: What was the golfer's winning margin at the Texas International Open PGA Tour with 6 wins by Peter Thomson?