(S (S (S (NP (NP (BASENP (DT The) (DT a) (NN scan)) (PP (IN of) (NP (BASENP (DT the) (NNP Shuttle) (POS 's)) (BASENP (NN heat) (NN shield))))) (PRN (LRB -LRB-) (NP (NP (ADVP (RB now)) (BASENP (NN routine))) (PP (IN since) (BASENP (DT the) (NNP Space) (NNP Shuttle) (NNP Columbia) (NN disaster)))) (RRB -RRB-))) (VP (VBD showed) (NP (BASENP (DT no) (NN cause)) (PP (IN for) (BASENP (NN concern)))))) (CC and) (S (BASENP (NNP Discovery)) (VP (VBD was) (VP (VBN cleared) (PP (IN for) (NP (BASENP (DT the) (NN voyage)) (ADVP (RB home)))))))) (PERIOD .))