ATC speed assignment

lets say they assign you 210 knots
is it airspeed or groundspeed?

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I believe airspeed but I’m not too sure that’s how I always adjust my speed by following airspeed but apparently ATC can only see your Ground Speed so I’m thinking maybe it’s in Ground Speed

It is IAS (airspeed)

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Thanks :D
saw you at tncm again btrw
you were parking

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