( These ( ( ( go ( in ( the model ) ) ) and ) ( measure ( ( the ( tilt angle ) ) ( of ( ( the model ) ( -LRB- ( ( called ( ( the angle ) ( of ( attack . ) ) ) ) -RRB- ) ) ) ) ) ) ) )
(ROOT (FRAG (NP (DT These)) (VP (VP (VB go) (PP (IN in) (NP (DT the) (NN model)))) (CC and) (VP (VB measure) (NP (NP (DT the) (NN tilt) (NN angle)) (PP (IN of) (NP (NP (DT the) (NN model)) (PRN (-LRB- -LRB-) (VP (VBN called) (NP (NP (DT the) (NN angle)) (PP (IN of) (FRAG (NP (NN attack)) (. .))))) (-RRB- -RRB-)))))))))
These go in the model and measure the tilt angle of the model (called the angle of attack.)
(ROOT (S (NP (NP (NNP Instruments)) (SBAR (WHNP (WDT that)) (S (VP (VB measure) (NP (NP (DT the) (NN angle)) (PP (IN of) (NP (NP (DT the) (NN slope)) (PP (IN of) (NP (DT a) (NN volcano)))))))))) (VP (VBP are) (VP (VBN called) (NP (NN tilt) (NNS meters)))) (. .)))