key_words(cf = "air_pressure")
cat(key_words(cf = "air_pressure"))
key_words(gcmd = "Atmosphere > Atmospheric Pressure > Sea Level Pressure")
cat(key_words(gcmd = "Atmosphere > Atmospheric Pressure > Sea Level Pressure"))
# a different ERDDAP server
key_words(cf = "air_pressure", url = servers()$url[5])
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