( ( The graph ) ( also ( ( shows ( that ( ( ( the ( ( seasonal ( -LRB- ( ( winter ( to summer ) ) -RRB- ) ) ) variation ) ) ( in ( day length ) ) ) ( increases ( with ( increasing latitude ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NN graph)) (ADVP (RB also)) (VP (VBZ shows) (SBAR (IN that) (S (NP (NP (DT the) (ADJP (ADJP (JJ seasonal)) (PRN (-LRB- -LRB-) (NP (NP (NN winter)) (PP (TO to) (NP (NN summer)))) (-RRB- -RRB-))) (NN variation)) (PP (IN in) (NP (NN day) (NN length)))) (VP (VBZ increases) (PP (IN with) (NP (VBG increasing) (NN latitude))))))) (. .)))
The graph also shows that the seasonal (winter to summer) variation in day length increases with increasing latitude.
(ROOT (S (NP (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN increase)) (PP (IN in) (NP (NN length)))) (VP (VBZ happens) (PP (TO to) (NP (NN metal) (NN railroad) (NNS tracks))) (PP (IN during) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (DT a) (NN summer) (NN day)))))) (. .)))