yield	SO2	ozone
1.52	absent	absent
1.85	absent	absent
1.39	absent	absent
1.49	present	absent
1.55	present	absent
1.21	present	absent
1.15	absent	present
1.30	absent	present
1.57	absent	present
.65	present	present
.76	present	present
.69	present	present