LOCATION: EMS_CAT
| Short Description | Area Source Formatted Lookup Table |
| Created By | ssad.sas |
| ASCII Input File | ems_sys(ssad.in) |
| # | Variable | TYPE | LENGTH | DESCRIPTION |
| 1 | STID | Number | 8 | FIPS state code |
| 2 | CYID | Number | 8 | FIPS county code |
| 3 | ASCT | Character | 15 | area source category code |
| 4 | SSC | Character | 3 | spatial surrogate code |