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Table 2

Relative errors of MATISSE at 70% of the error distribution.

Teff (K) log    g (dex) [M/H] (dex)
SNR (pixel-1) 100 50 20 10 100 50 20 10 100 50 20 10
KII-IV, [M/H]  >  –0.5 dex 50 48 103 157 0.07 0.14 0.30 0.52 0.09 0.10 0.12 0.21
KII-IV, –1  <  [M/H]  <  –0.5 dex 56 67 119 234 0.13 0.18 0.42 0.79 0.08 0.09 0.18 0.30
KII-IV, –2  <  [M/H]  <  –1 dex 72 85 175 328 0.16 0.26 0.78 1.32 0.15 0.17 0.26 0.43
KII-IV, [M/H]  <  –2 dex 56 70 200 386 0.24 0.56 1.17 1.72 0.12 0.13 0.21 0.60
GII-IV, [M/H]  >  –0.5 dex 63 73 133 272 0.10 0.12 0.29 0.81 0.08 0.08 0.18 0.29
GII-IV, –1  <  [M/H]  <  –0.5 dex 67 84 163 307 0.13 0.19 0.54 1.12 0.07 0.11 0.18 0.39
GII-IV, –2  <  [M/H]  <  –1 dex 66 120 281 407 0.18 0.30 0.92 1.52 0.17 0.18 0.25 0.43
GII-IV, [M/H]  <  –2 dex 131 297 528 729 0.33 0.63 1.85 2.51 0.18 0.34 0.56 1.33
FII-IV, all [M/H] 80 110 127 150 0.11 0.15 0.17 0.25 0.07 0.10 0.17 0.23
KV, [M/H]  > –0.5 dex 56 61 90 140 0.09 0.13 0.28 0.54 0.08 0.09 0.15 0.27
KV, –1  <  [M/H]  <  –0.5 dex 71 76 102 181 0.12 0.17 0.32 0.82 0.09 0.09 0.17 0.32
KV, –2  <  [M/H]  <  –1 dex 88 99 138 260 0.17 0.25 0.52 1.78 0.15 0.18 0.24 0.40
KV, [M/H]  <  –2 dex 93 114 210 554 0.32 0.36 0.47 1.50 0.16 0.16 0.27 0.58
GV,  > –0.5 dex 55 90 254 439 0.08 0.15 0.42 0.86 0.09 0.10 0.23 0.38
GV, –1  <  [M/H]  <  –0.5 dex 62 195 329 587 0.11 0.33 0.54 1.62 0.08 0.13 0.23 0.39
GV, –2  <  [M/H]  <  –1 dex 110 296 502 798 0.17 0.50 0.80 2.52 0.17 0.21 0.33 0.51
GV, [M/H]  <  –2 dex 472 561 861 1136 0.71 0.95 2.64 3.56 0.26 0.34 0.69 1.28
FV,  > –0.5 dex 57 106 330 552 0.10 0.18 0.41 0.84 0.10 0.12 0.26 0.41
FV, –1  <  [M/H]  <  –0.5 dex 71 165 405 730 0.12 0.27 0.50 1.14 0.10 0.15 0.31 0.46
FV, –2  <  [M/H]  <  –1 dex 137 340 575 1075 0.18 0.43 0.75 1.88 0.17 0.23 0.42 0.68
FV, [M/H]  <  –2 dex 1249 1314 1389 1529 1.28 1.63 2.86 3.43 1.92 2.13 2.23 2.04
Thin disc dwarfs 52 92 228 382 0.08 0.15 0.35 0.69 0.09 0.10 0.21 0.34
Thick disc dwarfs 67 207 364 662 0.11 0.33 0.53 1.51 0.10 0.13 0.25 0.42
Halo giants 74 116 263 432 0.19 0.34 1.00 1.72 0.16 0.18 0.27 0.45

Notes. Because of the poor statistics on FII-IV stars, all the metallicities were considered to infer the published value. The three last lines represent the accuracies of the method for typical old thin disc dwarfs (log    g > 3.9, −0.5 <  [M/H]  < −0.25 dex), thick disc dwarfs ((log    g > 3.9, −1.5 <  [M/H]  < −0.5 dex) and halo giants (Teff < 6000 K, log    g < 3.5, −2.5 <  [M/H]  < −1.25 dex).

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