label_x	label_y	mass_difference	abundance_x	abundance_y	ion_mode
C	(13C)	1.003355	100	1.07	both
S	(34S)	1.995796	100	4.21	both
K	(41K)	1.998119	100	6.73	pos
Cl	(37Cl)	1.997050	100	24.23	neg
