( ( The primary ) ( ( mirror ( ( thermal ( control system ) ) ( can ( maintain ( ( the temperature ) ( of ( ( ( ( ( ( ( the surface ) ( of ( ( the mirror ) ( to ( within ( 0.2 C ) ) ) ) ) ) ( of ( the ( ambient ( air temperature ) ) ) ) ) , ) ( eliminating ( mirror seeing ) ) ) , ) ( which ( is ( ( caused ( by turbulence ) ) ( in ( ( cool air ) ( over ( a ( warmer ( mirror surface ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN primary)) (VP (VBP mirror) (SBAR (S (NP (JJ thermal) (NN control) (NN system)) (VP (MD can) (VP (VB maintain) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (NP (DT the) (NN mirror)) (PP (TO to) (NP (IN within) (CD 0.2) (NNS C))))) (PP (IN of) (NP (DT the) (JJ ambient) (NN air) (NN temperature))) (, ,) (VP (VBG eliminating) (NP (NP (NN mirror)) (VP (VBG seeing)))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NN turbulence))) (PP (IN in) (NP (NP (JJ cool) (NN air)) (PP (IN over) (NP (DT a) (JJR warmer) (NN mirror) (NN surface))))))))))))))))) (. .)))
The primary mirror thermal control system can maintain the temperature of the surface of the mirror to within 0.2 C of the ambient air temperature, eliminating mirror seeing, which is caused by turbulence in cool air over a warmer mirror surface.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT the) (NN water)) (VP (VBP vapor) (PP (IN from) (NP (DT a) (JJ hot) (NN shower) (NNS contacts))) (NP (NP (DT the) (JJR cooler) (NN surface)) (PP (IN of) (NP (DT a) (NN mirror))))))) (, ,) (NP (DT the) (NN result)) (VP (VBZ is) (SBAR (IN that) (S (NP (NNP foggy)) (VP (VBP mirror))))) (. .)))