The study focuses on ozone-temperature covariation: ground-level ozone increases with temperatures.
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	2:det	Discourse=organization-preparation:18->19:2|Entity=(27-abstract-giv:inact-cf2-2-coref
2	study	study	NOUN	NN	Number=Sing	3	nsubj	3:nsubj	Entity=27)
3	focuses	focus	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	_
4	on	on	ADP	IN	_	8	case	8:case	_
5	ozone	ozone	NOUN	NN	Number=Sing	7	compound	7:compound	Entity=(54-event-new-cf5-4-sgl(5-substance-giv:inact-cf3-1-coref)|SpaceAfter=No|XML=<w>
6	-	-	PUNCT	HYPH	_	5	punct	5:punct	SpaceAfter=No
7	temperature	temperature	NOUN	NN	Number=Sing	8	compound	8:compound	Entity=(55-abstract-new-cf1-1-coref)|XML=</w>
8	covariation	covariation	NOUN	NN	Number=Sing	3	obl	3:obl:on	Entity=54)|SpaceAfter=No|XML=<ref></ref>
9	:	:	PUNCT	:	_	10	punct	10:punct	_
10	ground	ground	NOUN	NN	Number=Sing	12	compound	12:compound	Bridge=5<57|Discourse=joint-other_m:19->6:5|Entity=(56-event-new-cf6-5-sgl(57-substance-acc:inf-cf4-4-sgl|SpaceAfter=No|XML=<ref><w>
11	-	-	PUNCT	HYPH	_	10	punct	10:punct	SpaceAfter=No
12	level	level	NOUN	NN	Number=Sing	13	compound	13:compound	XML=</w>
13	ozone	ozone	NOUN	NN	Number=Sing	14	nsubj	14:nsubj	Entity=57)|XML=</ref>
14	increases	increase	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	parataxis	3:parataxis	_
15	with	with	ADP	IN	_	16	case	16:case	_
16	temperatures	temperature	NOUN	NNS	Number=Plur	14	obl	14:obl:with	Entity=(55-abstract-giv:act-cf1-1-coref)56)|SpaceAfter=No
17	.	.	PUNCT	.	_	3	punct	3:punct	_
