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| L/- | key source by Level only |
|---|---|
| -/T | key source by Trend only |
| L/T | key source by both Level and Trend |
| -/- | no key source for this pollutant |
| IE | emission of specific pollutant Included Elsewhere (i.e. in another category) |
| NE | emission of specific pollutant Not Estimated (yet) |
| NA | specific pollutant not emitted from this source or activity = Not Applicable |
| * | no analysis done |