(S (S (PP (IN In) (BASENP (NN particular))) (COMMA ,) (S (NP (BASENP (DT the) (NN presence)) (PP (IN of) (NP (BASENP (JJ small) (JJ electrical) (NNS charges)) (PP (IN on) (BASENP (DT the) (NNS gyroscopes)))))) (VP (VBD interfered) (PP (IN with) (BASENP (PRPD their) (NNS results)))))) (PERIOD .))