# This data dictionary contains all of the isotope abundance data
# needed to simulate mass spectra. The element name is the key, which
# is followed by a list in [] of pairs of numbers in (), which provide
# the exact mass and the percentage abundance of each isotope, respectively
data = { 
'H' : [(1.007825, 99.9885),(2.014102, 0.0115)], 
'C' : [ (12.0, 98.93),(13.003355, 1.07)],
'N' : [(14.003074, 99.632),(15.000109, 0.368)],
'O' : [(15.994915 , 99.757),(16.999132, 0.038),(17.999160,0.205)]
}