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:
| No. | Date | Tournament | Winning score | Margin\nof victory | Runner(s)-up |
| --- | --- | --- | --- | --- | --- |
| 1 | May 27, 1956 | Dallas Centennial Open | −12 (64-67-70-67=268) | 1 stroke | Dow Finsterwald, Doug Ford |
| 2 | Feb 21, 1960 | Tucson Open Invitational | −9 (67-67-68-69=271) | 3 strokes | Bob Harris |
| 3 | Jul 9, 1961 | St. Paul Open Invitational | −19 (66-71-68-64=269) | 1 stroke | Buster Cupit |
| 4 | Feb 17, 1963 | Tucson Open Invitational | −22 (65-67-69-65=266) | 11 strokes | Gene Littler, Phil Rodgers |
| 5 | Aug 28, 1966 | Philadelphia Golf Classic | −10 (69-69-68-71=278) | 1 stroke | Jack Nicklaus |
| 6 | Jul 24, 1967 | PGA Championship | −7 (71-72-70-68=281) | Playoff | Don Massengale |
| 7 | Apr 21, 1968 | Tournament of Champions | −8 (70-68-69-69=276) | 1 stroke | Julius Boros |
| 8 | Mar 23, 1970 | Greater Jacksonville Open | −9 (68-75-70-66=279) | Playoff | Dale Douglass |
| 9 | Oct 19, 1975 | San Antonio Texas Open | −13 (71-67-71-66=275) | Playoff | Larry Hinson |
| 10 | Apr 18, 1976 | MONY Tournament of Champions | −11 (71-68-69-69=277) | 5 strokes | Hubert Green |
Question:
what is the difference of winning score between the san antonio texas open and the dallas centennial open?
Answer:
1