( ( ( ( ( In addition ) ( , ( ( the authors ) ( site ( ( a ( proactive program ) ) ( that ( was ( ( begun ( in Memphis ) ) ( after ( the ( 1980 ( heat wave ) ) ) ) ) ) ) ) ) ) ) ) : ) ( ( In ( early summer ) ) ( , ( officials ( track ( ( the numbers ) ( of ( persons ( ( seen ( in ( emergency departments ) ) ) ( to ( try ( to ( ( detect ( any increase ) ) ( in ( visits ( due ( to ( the heat ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (PP (IN In) (NP (NN addition))) (, ,) (NP (DT the) (NNS authors)) (VP (VBZ site) (NP (NP (DT a) (JJ proactive) (NN program)) (SBAR (WHNP (WDT that)) (S (VP (VBD was) (VP (VBN begun) (PP (IN in) (NP (NNP Memphis))) (PP (IN after) (NP (DT the) (CD 1980) (NN heat) (NN wave)))))))))) (: :) (S (PP (IN In) (NP (JJ early) (NN summer))) (, ,) (NP (NNS officials)) (VP (VBP track) (NP (NP (DT the) (NNS numbers)) (PP (IN of) (NP (NP (NNS persons)) (VP (VBN seen) (PP (IN in) (NP (NN emergency) (NNS departments))) (S (VP (TO to) (VP (VB try) (S (VP (TO to) (VP (VB detect) (NP (DT any) (NN increase)) (PP (IN in) (NP (NP (NNS visits)) (ADJP (JJ due) (PP (TO to) (NP (DT the) (NN heat)))))))))))))))))) (. .)))
In addition, the authors site a proactive program that was begun in Memphis after the 1980 heat wave: In early summer, officials track the numbers of persons seen in emergency departments to try to detect any increase in visits due to the heat.
(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)))))) (. .)))