Table 1: Coefficients to estimate the expected random error in typical line-strength indices and colors, as a function of the mean signal-to-noise ratio per Å, following Eq. (3). Note that these coefficients are valid for atomic indices when measured in magnitudes (i.e. as if they were molecular indices). For line-strength indices measured in Å see coefficients in Table 1 in Cardiel et al. (1998).
Index c Index c Color c

$\tilde{\rm D}_{4000}$ 0.109 Fe4531 0.273 $(u-g)_{\rm AB}$ 0.0500

H $\delta_{\rm {A}}$ 0.217 Fe4668 0.224 $(g-r)_{\rm AB}$ 0.0421

H $\delta_{\rm {F}}$ 0.281 H $\beta$ 0.276 $(g-i)_{\rm AB}$ 0.0412

CN₁ 0.224 Fe5015 0.234 $(g-z)_{\rm AB}$ 0.0393

CN₂ 0.269 Mg₁ 0.166 $(g-J)_{\rm AB}$ 0.0368

Ca4227 0.400 Mg₂ 0.193 $(g-H)_{\rm AB}$ 0.0354

G4300 0.265 Mgb 0.268 $(g-K{\rm s})_{\rm AB}$ 0.0348

H $\gamma_{\rm {A}}$ 0.204 Fe5270 0.251 (U-B) 0.0502

H $\gamma_{\rm {F}}$ 0.274 Fe5335 0.292 (B-V) 0.0434

H $\gamma_{\rm {HR}}$ 0.887 Fe5406 0.314 (V-R) 0.0373

H $\gamma_{{\rm VA,125}}$ 0.260 Fe5709 0.291 (V-I) 0.0367

H $\gamma_{{\rm VA,200}}$ 0.233 Fe5782 0.333 (V-J) 0.0391

H $\gamma_{{\rm VA,275}}$ 0.218 Na5895 0.271 (V-K) 0.0352

Fe4383 0.280 TiO₁ 0.182 (R-I) 0.0285

Ca4455 0.340 TiO₂ 0.157 (J-H) 0.0309

(H-K) 0.0257

**Table 1:** Coefficients to estimate the expected random error in typical line-strength indices and colors, as a function of the mean signal-to-noise ratio per Å, following Eq. (3). Note that these coefficients are valid for atomic indices when measured in magnitudes (i.e. as if they were molecular indices). For line-strength indices measured in Å see coefficients in Table 1 in Cardiel et al. (1998).
Index	c	Index	c	Color	c
$\tilde{\rm D}_{4000}$	0.109	Fe4531	0.273	$(u-g)_{\rm AB}$	0.0500
H $\delta_{\rm {A}}$	0.217	Fe4668	0.224	$(g-r)_{\rm AB}$	0.0421
H $\delta_{\rm {F}}$	0.281	H $\beta$	0.276	$(g-i)_{\rm AB}$	0.0412
CN₁	0.224	Fe5015	0.234	$(g-z)_{\rm AB}$	0.0393
CN₂	0.269	Mg₁	0.166	$(g-J)_{\rm AB}$	0.0368
Ca4227	0.400	Mg₂	0.193	$(g-H)_{\rm AB}$	0.0354
G4300	0.265	Mgb	0.268	$(g-K{\rm s})_{\rm AB}$	0.0348
H $\gamma_{\rm {A}}$	0.204	Fe5270	0.251	(U-B)	0.0502
H $\gamma_{\rm {F}}$	0.274	Fe5335	0.292	(B-V)	0.0434
H $\gamma_{\rm {HR}}$	0.887	Fe5406	0.314	(V-R)	0.0373
H $\gamma_{{\rm VA,125}}$	0.260	Fe5709	0.291	(V-I)	0.0367
H $\gamma_{{\rm VA,200}}$	0.233	Fe5782	0.333	(V-J)	0.0391
H $\gamma_{{\rm VA,275}}$	0.218	Na5895	0.271	(V-K)	0.0352
Fe4383	0.280	TiO₁	0.182	(R-I)	0.0285
Ca4455	0.340	TiO₂	0.157	(J-H)	0.0309
				(H-K)	0.0257

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