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:
| Formula | Notation | T c (K) | No. of Cu-O planes in unit cell | Crystal structure |
| --- | --- | --- | --- | --- |
| YBa 2 Cu 3 O 7 | 123 | 92.0 | 2.0 | Orthorhombic |
| Bi 2 Sr 2 CuO 6 | Bi-2201 | 20.0 | 1.0 | Tetragonal |
| Bi 2 Sr 2 CaCu 2 O 8 | Bi-2212 | 85.0 | 2.0 | Tetragonal |
| Bi 2 Sr 2 Ca 2 Cu 3 O 6 | Bi-2223 | 110.0 | 3.0 | Tetragonal |
| Tl 2 Ba 2 CuO 6 | Tl-2201 | 80.0 | 1.0 | Tetragonal |
| Tl 2 Ba 2 CaCu 2 O 8 | Tl-2212 | 108.0 | 2.0 | Tetragonal |
| Tl 2 Ba 2 Ca 2 Cu 3 O 10 | Tl-2223 | 125.0 | 3.0 | Tetragonal |
| TlBa 2 Ca 3 Cu 4 O 11 | Tl-1234 | 122.0 | 4.0 | Tetragonal |
| HgBa 2 CuO 4 | Hg-1201 | 94.0 | 1.0 | Tetragonal |
| HgBa 2 CaCu 2 O 6 | Hg-1212 | 128.0 | 2.0 | Tetragonal |
Question:
How many times is the formula tl 2 ba 2 cuo 6?
Answer:
1.0