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| A = | High quality spectrum, high signal to noise and well defined HI profile |
| B = | good signal to noise ratio, well defined edges of the line, width OK for TF applications |
| C = | low signal to noise, noisy or asymmetrical profile, but well defined systemic radial velocity |
| D = | low signal to noise, noisy profile at the limit of detection. Rejected |
| E = | not detected |
| B+ = | we can not choose between A or B |
| C+ = | we can not choose between B or C |