(S (S (NP (BASENP (NNP Australia) (POS 's)) (BASENP (JJ area-averaged) (NN rainfall))) (VP (VBZ is) (VP (VBN calculated) (PP (IN from) (NP (BASENP (DT a) (NN network)) (PP (IN of) (BASENP (QP (RB around) (NN 5000)) (NN rainfall) (NNS stations)))))))) (PERIOD .))