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:
| Usage | Sn/Sb (%) | Liquid at (°C) | Casting at (°C) | Remelting at (°C) | Hardness |
| --- | --- | --- | --- | --- | --- |
| Typograph | 3/12 | 250 | 280…290 | 310…330 | 19 |
| Ludlow | 5/12 | 245 | 270…285 | 300…320 | 21 |
| Lino/Intertype a | 5/12 | 245 | 270…285 | 300…320 | 21 |
| Lino/Intertype b | 6/12 | 243 | 270…285 | 300…320 | 21.5 |
| Lino/Intertype c | 7/12 | 241 | 270…285 | 300…320 | 22 |
| Stereotyping | 5/15 | 265 | 320 | 320…340 | 23 |
| Stereotyping | 7/14 | 258 | 315 | 320…340 | 23 |
| Monotype a | 5/15 | 265 | 350 | 330…350 | 23 |
| Monotype b | 8/15 | 260 | 360 | 350…370 | 25 |
| Monotype c | 7/17 | 280 | 370 | 360…380 | 26 |
| Monotype d | 9/19 | 285 | 390 | 380…400 | 28.5 |
| Monotype e | 9.5/15 | 270 | 360 | 350…370 | 26 |
| Monotype f | 9.5/17 | 280 | 380 | 370…390 | 27.5 |
| Monotype g | 10/16 | 275 | 370 | 360…380 | 27 |
| Regeneration a | 9/11 | — | — | — | — |
| Regeneration b | 9/12 | — | — | — | — |
| Regeneration c | 9/16 | — | — | — | — |
| Support metal a | 1/2 | 310 | — | 360…380 | 6 |
| Support metal b | 3/5 | 295 | — | 340…360 | 14 |
| Support metal c | 5/5 | 280 | — | 340…360 | 16 |
| Typefounding | 5.5/28.5 | 360 | — | 420…430 | 29.5 |
Question:
What is the casting temperature for the alloy with hardness 21?
Answer:
270…285, 270…285