Table 1.
Morphological classification.
| Name | Precise | Nin/Nap | δ | Not possible | Leads to |
|---|---|---|---|---|---|
| name | if  |
 |
|||
| Standard | 11 | 1/0 | + | – | – |
| Four-lobe | 1111 | 3/0 | − | – | – |
| Double-peak | 2 | 1/0 | − | – | ✓ |
| Q-like | 111 | 2/0 | − | – | ✓ |
| Single-lobe | 10, 01 | 2/1 | 0 | – | ✓ |
| Three-lobe | 12, 21 | 2/1 | − | – | ≈ |
| Big-lobe | 1 | 0/0 | − | ✓ | ✓ |
Notes. Names in first column distinguish alternate-sign signals from single-sign ones: e.g., a three-lobe signal differs from a triple-lobe (not shown) in that the latter has all peaks of the same sign. Names in second column identify signals by the number of consecutive peaks with the same sign: e.g., 12 (one, two) means one peak of one sign and two peaks of the opposite sign. Nin is number of zeroes in absorption band and Nap how many of them are “by approximation”.
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