sentence: If there were singlet trimers with voltage in the range of 6900 V to 7300 V , then the corresponding doublet trimers would range from 3450 V to 3650 V. For run A the particle concentration measured at 6990 V , 7240 V , and 7490 were ( 5.8 , 6.0 , and 16.5 ) cm , respectively , compared to a peak concentration of 97 cm .