( ( A ( printed graph ) ) ( ( is ( given ( out ( ( ( ( each time ) ( ( the BTG ) ( is used ) ) ) , ) ( which ( shows ( ( the ( exact depth ) ) ( where ( ( the temperature ) ( changes rapidly ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (VBN printed) (NN graph)) (VP (VBZ is) (VP (VBN given) (PP (IN out) (NP (NP (DT each) (NN time)) (SBAR (S (NP (DT the) (NNP BTG)) (VP (VBZ is) (VP (VBN used))))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ shows) (NP (NP (DT the) (JJ exact) (NN depth)) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NN temperature)) (VP (VBZ changes) (ADVP (RB rapidly))))))))))))) (. .)))
A printed graph is given out each time the BTG is used, which shows the exact depth where the temperature changes rapidly.
(ROOT (S (NP (NNP Line) (NNS graphs)) (VP (VBP are) (ADJP (RB especially) (JJ useful) (PP (IN for) (S (VP (VBG showing) (NP (NNS changes)) (PP (IN over) (NP (NN time)))))))) (. .)))