( ( Outside ( the ( solenoid coil ) ) ) ( ( is ( ( ( the ( iron ( flux return ) ) ) , ) ( ( interleaved ( with ( planar ( wire ( chamber detectors ) ) ) ) ) ( to ( register ( ( the passage ) ( of ( penetrating muons ) ) ) ) ) ) ) ) . ) )
(ROOT (SINV (PP (IN Outside) (NP (DT the) (JJ solenoid) (NN coil))) (VP (VBZ is)) (NP (NP (DT the) (NN iron) (NN flux) (NN return)) (, ,) (VP (VBN interleaved) (PP (IN with) (NP (NN planar) (NN wire) (NN chamber) (NNS detectors))) (S (VP (TO to) (VP (VB register) (NP (NP (DT the) (NN passage)) (PP (IN of) (S (VP (VBG penetrating) (NP (NNS muons))))))))))) (. .)))
Outside the solenoid coil is the iron flux return, interleaved with planar wire chamber detectors to register the passage of penetrating muons.
(ROOT (S (NP (DT An) (NN electormagnet)) (VP (VBZ is) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (NP (NN iron)) (PP (IN inside) (NP (DT a) (NN solenoid))))))) (. .)))