Variable
fluorene
dibenzo_ah_anthracene
benz_a_anthracene
zinc
acenaphthene
arsenic
chromium
acenaphthylene
lead
fluoranthene
naphthalene
pyrene
phenanthrene
nickel
benzo_bj_fluoranthenes
cadmium
chrysene
benzo_ghi_perylene
anthracene
inden_123cd_pyrene
benzo_k_fluoranthene