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:
| Vertical | Horizontal | Aspect ratio | Pixel aspect ratio | Scanning | Frame rate ( Hz ) |
| --- | --- | --- | --- | --- | --- |
| 1080.0 | 1920.0 | 16:9 | 1:1 | progressive | 23.976 24 29.97 30 |
| 1080.0 | 1920.0 | 16:9 | 1:1 | interlaced | 29.97 (59.94 fields/s) 30 (60 fields/s) |
| 720.0 | 1280.0 | 16:9 | 1:1 | progressive | 23.976 24 29.97 30 59.94 60 |
| 480.0 | 704.0 | 4:3 or 16:9 | SMPTE 259M | progressive | 23.976 24 29.97 30 59.94 60 |
| 480.0 | 704.0 | 4:3 or 16:9 | SMPTE 259M | interlaced | 29.97 (59.94 fields/s) 30 (60 fields/s) |
| 480.0 | 640.0 | 4:3 | 1:1 | progressive | 23.976 24 29.97 30 59.94 60 |
Question:
What was the maximum vertical measurement if the horizon measurement is 640?
Answer:
480.0