Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Tournament | Winning score | Margin of victory | Runner(s)-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 margin of victory at the Texas International Open?
Answer:
Playoff