( ( For ( ( ( a ( given position ) ) ( of ( the ( beryllium source ) ) ) ) ( relative ( to ( the counter ) ) ) ) ) ( , ( ( ( the number ) ( of ( recoil atoms ) ) ) ( ( was ( ( roughly ( the same ) ) ( for ( each gas ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NP (DT a) (VBN given) (NN position)) (PP (IN of) (NP (DT the) (NN beryllium) (NN source))) (ADVP (JJ relative) (PP (TO to) (NP (DT the) (NN counter)))))) (, ,) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (JJ recoil) (NNS atoms)))) (VP (VBD was) (NP (NP (RB roughly) (DT the) (JJ same)) (PP (IN for) (NP (DT each) (NN gas))))) (. .)))
For a given position of the beryllium source relative to the counter, the number of recoil atoms was roughly the same for each gas.
(ROOT (S (NP (NP (DT The) (JJ low) (JJ atomic) (NN number)) (PP (IN of) (NP (NN beryllium)))) (VP (VBZ allows) (S (NP (PRP it)) (VP (TO to) (VP (VB absorb) (NP (NNPS x-rays)))))) (. .)))