Proportion of traps in habitat X	SSet	SSet	SSet	SSet	CV
0	0·249	0·250	0·248	0·252	0·007
0·1	0·261	0·262	0·261	0·264	0·005
0·2	0·277	0·277	0·276	0·279	0·005
0·3	0·283	0·285	0·282	0·284	0·005
0·4	0·287	0·289	0·287	0·288	0·003
0·5	0·286	0·288	0·287	0·286	0·003
0·6	0·289	0·291	0·289	0·288	0·004
0·7	0·284	0·287	0·285	0·283	0·006
0·8	0·280	0·282	0·281	0·279	0·005
0·9	0·282	0·284	0·282	0·280	0·006
1·0	0·379	0·383	0·380	0·381	0·004

Four different grid-cell sizes and associated P_u* values across a varying range of proportion of traps in habitat X were explored. The SSe_t was calculated for each trial and the coefficient of variation (CV) was calculated across trials with different grid-cell sizes. A lack of effect of grid-cell size is indicated by low CV values for trials across grid-cell sizes (across rows). As expected, SSe_t increases with increasing percentage of landscape covered by traps (down columns).