Fig. 11
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High-ionization emission line ratios for σ-Orionis sources in both datasets (MIKE and X-shooter). Left: [OI]6300/([SII]6716+[SII]6731) line ratio. Rigth: [NII]6583/([SII]6716+[SII]6731) line ratio. Highly irradiated disks are expected to have a lower [OI]6300/([SII]6716+[SII]6731) ratio and higher [NII]6583/([SII]6716+[SII]6731) ratio compared to low-mass SFRs like Taurus. We only considered the LVC of each line in our estimate.
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