Notes. For each survey and each simulation, f_{obs_c} gives the fraction of successfully completed targets and f_suc gives the fraction of observed targets that receive their full required exposure, which are thus deemed successful. The ratio of these, f_{obs_c}/f_suc, gives the total fraction of targets observed (not necessarily to completion). The values f_{obs_c} should be compared with the f_compl value, which represents the fraction of targets that had been expected to reach completion.