( ( The numbers ) ( ( ( measure ( the ( atmospheric pressure ) ) ) ( in millibars ) ) . ) )
(ROOT (S (NP (DT The) (NNS numbers)) (VP (VB measure) (NP (DT the) (JJ atmospheric) (NN pressure)) (PP (IN in) (NP (NNS millibars)))) (. .)))
The numbers measure the atmospheric pressure in millibars.
(ROOT (S (NP (NNP Millibar)) (VP (VBZ is) (NP (NP (DT the) (NN unit)) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN air) (NN pressure)))))))) (. .)))