| Class | Peak Burst Intensity (I) Measured at Earth in the 1 to 8 angstrom band (watts per square meter) |
|---|---|
| B | I < 10−6 |
| C | 10−6 ≤ I < 10−5 |
| M | 10−5 ≤ I < 10−4 |
| X | I ≥ 10−4 |
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Last revised: 4 May 2004.