Table 2: SNR achieved for the different spectra for the three ranges observed with the INT+ IDS.
HD  4000-5000 4600-5100 H $_{\rm\alpha }$
HD 37020 170-280 210 220
HD 37022 170-330 280 290
HD 37023 220-450 450 320
HD 37041 200-275 230 210
HD 37042 160-220 250 230
HD 214680 140-190 200 160
HD 47839 89-120 160 260


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