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:
| Subframe # | Page # | Name | Word # | Bits | Scale | Signed |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | all | Week Number | 3.0 | 1–10 | 1:1 | No |
| 1.0 | all | CA or P On L2 | 3.0 | 11,12 | 1:1 | No |
| 1.0 | all | URA Index | 3.0 | 13–16 | 1:1 | No |
| 1.0 | all | SV_Health | 3.0 | 17–22 | 1:1 | No |
| 1.0 | all | IODC(MSB) | 3.0 | 23,24 | 1:1 | No |
| 1.0 | all | L2Pdata flag | 4.0 | 1 | 1:1 | No |
| 1.0 | all | ResW4 | 4.0 | 2–24 | N/A | N/A |
| 1.0 | all | ResW5 | 5.0 | 1–24 | N/A | N/A |
| 1.0 | all | ResW6 | 6.0 | 1–24 | N/A | N/A |
| 1.0 | all | ResW7 | 7.0 | 1–16 | N/A | N/A |
| 1.0 | all | TGD | 7.0 | 17–24 | 2^-31 | Yes |
| 1.0 | all | IODC (LSB) | 8.0 | 1–8 | 1:1 | No |
| 1.0 | all | TOC | 8.0 | 9–24 | 2^4 | No |
| 1.0 | all | AF2 | 9.0 | 1–8 | 2^-55 | Yes |
| 1.0 | all | AF1 | 9.0 | 9–24 | 2^-43 | Yes |
| 1.0 | all | AF0 | 10.0 | 1–22 | 2^-31 | Yes |
Question:
What is URA Index scale?
Answer:
1:1