( ( ( ( ( ( ( Mercury 's ) axis ) ( has ( ( the ( smallest tilt ) ) ( of ( any ( of ( ( the ( Solar ( System 's ) ) ) planets ) ) ) ) ) ) ) , ) but ) ( ( ( Mercury 's ) ( orbital eccentricity ) ) ( is ( the largest ) ) ) ) . )
(ROOT (S (S (NP (NP (NNP Mercury) (POS 's)) (NNS axis)) (VP (VBZ has) (NP (NP (DT the) (JJS smallest) (NN tilt)) (PP (IN of) (NP (NP (DT any)) (PP (IN of) (NP (NP (DT the) (NNP Solar) (NNP System) (POS 's)) (NNS planets)))))))) (, ,) (CC but) (S (NP (NP (NNP Mercury) (POS 's)) (JJ orbital) (NN eccentricity)) (VP (VBZ is) (NP (DT the) (JJS largest)))) (. .)))
Mercury's axis has the smallest tilt of any of the Solar System's planets, but Mercury's orbital eccentricity is the largest.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))