Variable
fluorene
dibenzo_ah_anthracene
benzo_ghi_perylene
acenaphthene
fluoranthene
pyrene
benzo_j_fluoranthene
phenanthrene
benzo_a_pyrene
acenaphthylene
benzo_b_fluoranthene
naphthalene
anthracene
inden_123cd_pyrene
benz_a_anthracene
benzo_k_fluoranthene
chrysene