Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| engine type | scenario | sfc in lb / (lbf h) | sfc in g / (kn s) | specific impulse (s) | effective exhaust velocity (m / s) |
| nk - 33 rocket engine | vacuum | 10.9 | 309.0 | 331 | 3240 |
| ssme rocket engine | space shuttle vacuum | 7.95 | 225.0 | 453 | 4423 |
| ramjet | mach 1 | 4.5 | 127.0 | 800 | 7877 |
| j - 58 turbojet | sr - 71 at mach 3.2 (wet) | 1.9 | 53.8 | 1900 | 18587 |
| rolls - royce / snecma olympus 593 | concorde mach 2 cruise (dry) | 1.195 | 33.8 | 3012 | 29553 |
| cf6 - 80c2b1f turbofan | boeing 747 - 400 cruise | 0.605 | 17.1 | 5950 | 58400 |
Title:
jet engine
Statement:
when the specific impulse is 453 , the sfc is greater than 225
Answer:
refuted