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:
| Track | Recorded | Catalogue | Release Date | Song Title | Time |
| --- | --- | --- | --- | --- | --- |
| 1.0 | 2/18/70 | 47-9835 | 4/20/70 | The Wonder of You | 2:34 |
| 2.0 | 6/4/70 | 47-9873 | 7/14/70 | I've Lost You | 3:30 |
| 3.0 | 6/7/70 | 47-9873b | 7/14/70 | The Next Step Is Love | 3:31 |
| 4.0 | 6/6/70 | 47-9916 | 10/6/70 | You Don't Have to Say You Love Me | 2:30 |
| 5.0 | 6/8/70 | 47-9916b | 10/6/70 | Patch It Up | 3:08 |
| 6.0 | 6/7/70 | 47-9960 | 12/8/70 | I Really Don't Want to Know | 2:54 |
| 7.0 | 6/8/70 | 47-9960b | 12/8/70 | There Goes My Everything | 2:58 |
| 8.0 | 9/22/70 | 47-9980 | 2/3/71 | Rags to Riches | 1:54 |
| 9.0 | 9/22/70 | 47-9980b | 2/3/71 | Where Did They Go, Lord | 2:27 |
| 10.0 | 6/6/70 | 47-9985 | 5/25/71 | Life | 3:10 |
| 11.0 | 5/20/71 | 47-9998 | 6/22/71 | I'm Leavin' | 3:51 |
| 12.0 | 6/6/70 | 47-9998b | 6/22/71 | Heart of Rome | 2:53 |
| 13.0 | 5/20/71 | 48-1017 | 9/21/71 | It's Only Love | 2:41 |
| 14.0 | 6/4/70 | 48-1017b | 9/21/71 | The Sound of Your Cry | 3:17 |
| 15.0 | 8/11/70 | 2158 | 11/71 | I Just Can't Help Believin' | 4:34 |
| 16.0 | 6/5/70 | 2158b | 11/71 | How the Web Was Woven | 3:25 |
| 17.0 | 5/17/71 | 74-0619 | 1/4/72 | Until It's Time for You to Go | 2:17 |
| 18.0 | 5/20/71 | 74-0619b | 1/4/72 | We Can Make the Morning | 3:54 |
| 19.0 | 2/16/72 | 74-0672 | 4/4/72 | An American Trilogy | 4:30 |
| 20.0 | 3/15/71 | 74-0672b | 4/4/72 | The First Time Ever I Saw Your Face | 3:42 |
| 21.0 | 3/28/72 | 74-0769 | 8/1/72 | Burning Love | 2:50 |
| 22.0 | 3/29/72 | 74-0769b | 8/1/72 | It's a Matter of Time | 3:02 |
| 23.0 | 3/27/72 | 74-0815 | 10/31/72 | Separate Ways | 2:36 |
Question:
What is Heart of Rome's catalogue number?
Answer:
47-9998b