A line on a map connecting places of equal atmospheric pressure (6)

I believe the answer is:

isobar

(Other definitions for isobar that I've seen before include "Map-line showing places with equal air pressure" , "Map line showing atmosphere pressure" , "curve on map" , "Line on map showing barometric pressure" , "Line on map connecting places of equal atmospheric pressure" .)

I've seen this clue in The Independent.

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