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Table 13.

Figure of merit (FoM) values for the w0 and wa parameters in flat and non-flat cosmologies for GCs, GCph, WL, and different combinations of these observables, including cross-correlations between photometric galaxy clustering and weak lensing.

w0, wa FoM Flat Non-flat
Linear setting
GCs 40 19

Pessimistic setting
GCs 14 10
WL 23 5

GCs+WL 99 40
GCph+WL 64 14
GCs+WL+GCph 123 49
WL+GCph+XC(GCph, WL) 367 59
GCs+WL+GCph+XC(GCph, WL) 377 128

Optimistic setting
GCs 55 19
WL 44 12

GCs+WL 157 87
GCph+WL 235 129
GCs+WL+GCph 398 218
WL+GCph+XC(GCph, WL) 1033 326
GCs+WL+GCph+XC(GCph, WL) 1257 500

Notes. The top (bottom) half of the table refers to the pessimistic (optimistic) settings, as defined in Sect. 5. For WL alone, not including IA would give a higher (but more unreliable) FoM of (27, 6) in the pessimistic setting, (54, 15) in the optimistic setting, for the flat and non-flat cosmologies respectively. We further note that for the photometric survey only (the combination GCph+WL+ in the table), no cut in z is needed in either pessimistic or optimistic settings. When, however both GCph and GCs probes are combined, the pessimistic setting only includes GCph for z <  0.9, since we lack an estimate of their cross-correlation, as discussed in Sect. 5.

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