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Legend (GulfDataAtlas/NOS_StaticThreeZoneSalinityScheme)

Static Salinity Zones (0)
Tidal Fresh Zone (0-0.5 ppt) Tidal Fresh Zone (0-0.5 ppt)
Mixing Zone (0.5-25 ppt) Mixing Zone (0.5-25 ppt)
Seawater Zone (>25 ppt) Seawater Zone (>25 ppt)
<all other values> <all other values>