( ( ( ( Graphs , ) especially ) ( ( ( ( ( those ( that ( show ( long ( time periods ) ) ) ) ) , ) or ) ( short ( rainfall intervals ) ) ) ( -LRB- ( ( which ( generate ( many ( data points ) ) ) ) -RRB- ) ) ) ) ( ( may ( ( require ( several minutes ) ) ( to complete ) ) ) . ) )
(ROOT (S (NP (NP (NNS Graphs)) (, ,) (RB especially) (NP (NP (NP (NP (DT those)) (SBAR (WHNP (WDT that)) (S (VP (VBP show) (NP (JJ long) (NN time) (NNS periods)))))) (, ,) (CC or) (NP (JJ short) (NNS rainfall) (NNS intervals))) (PRN (-LRB- -LRB-) (SBAR (WHNP (WDT which)) (S (VP (VBP generate) (NP (JJ many) (NN data) (NNS points))))) (-RRB- -RRB-)))) (VP (MD may) (VP (VB require) (NP (JJ several) (NNS minutes)) (S (VP (TO to) (VP (VB complete)))))) (. .)))
Graphs, especially those that show long time periods, or short rainfall intervals (which generate many data points) may require several minutes to complete.
(ROOT (S (NP (NN Period)) (VP (VBZ is) (NP (NP (DT the) (NN time) (NN interval)) (VP (VBN required) (PP (IN for) (NP (CD one) (JJ complete) (NN wave) (S (VP (TO to) (VP (VB pass) (NP (NP (DT a) (NN point)) (VP (VBN called))))))))))) (. .)))