Table 1 Summary of the analytical conditions, total secondary ion counts, count rates in counts per second, and yields of the 6 targets examined in CNS mode.

								Total count			Counts per second (cps)			Yield (cps/pA)			Active area based yield (cps/pA/area)
Fco	Target ID	Image	Frames	Sec/frm	Pixels	Scanned area (μm²)	Active area (%)	¹²C⁻	¹²C¹⁴N⁻	³²S⁻	¹²C⁻	¹²C¹⁴N⁻	³²S⁻	¹²C⁻	¹²C¹⁴N⁻	³²S⁻	¹²C⁻	¹²C¹⁴N⁻	³²S⁻
0.94	1	Fig. 2a	20	30	256 × 256	16 × 16	19	1.46E + 06	1.10E + 06	1.02E + 05	2,433	1,838	169	2,588	1,955	180	13,768	10,400	958
	2	Fig. 2b	20	30	256 × 256	18 × 18	26	2.47E + 06	2.06E + 06	2.60E + 05	4,118	3,432	434	4,381	3,651	461	16,722	13,935	1,761
	3	Fig. 2c	20	30	256 × 256	17 × 17	24	2.87E + 06	1.38E + 06	2.04E + 05	4,782	2,292	340	5,087	2,438	362	21,463	10,288	1,528
	4	Fig. 2d	20	30	256 × 256	18 × 18	17	2.02E + 06	9.56E + 05	1.28E + 05	3,373	1,593	213	3,589	1,695	227	21,109	9,968	1,335
	5	Fig. 2e	20	30	256 × 256	19 × 19	28	4.53E + 06	3.18E + 06	4.60E + 05	7,543	5,295	766	8,024	5,633	815	28,864	20,261	2,931
	6	Fig. 2f	20	30	256 × 256	20 × 20	19	2.52E + 06	1.72E + 06	1.96E + 05	4,201	2,869	327	4,469	3,052	347	23,646	16,147	1,839
										Averages	4,408	2,886	375	4,710	3,287	428	20,929	13,500	1,725
2.5	Gunflintia (sheath)*		30	30	256 × 256	20 × 20	28	1.33E + 06	2.74E + 05	5.70E + 04	1,475	305	63	590	122	25	2,092	432	90
	Gunflintia (sheath)*		60	30	256 × 256	35 × 35	33	9.22E + 05	9.32E + 04	3.51E + 04	512	52	20	205	21	8	614	62	23
	Gunflintia (sheath)*		30	30	256 × 256	30 × 30	28	1.10E + 06	1.57E + 05	3.84E + 04	1,220	174	43	488	70	17	1,756	251	61
										Averages	1,069	177	42	428	71	17	1,487	248	58

Fco: intensity of the primary beam; sec/frm: seconds for obtaining 1 frame of an image; scanned area: size of images in Fig. 2; active area: percentage of where carbon counts were observed from microfossils.
*Data are cited and recalculated from the same type of microfossil reported by Sasaki et al. (2022).

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