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. 2024 Jul 29;46(9):337. doi: 10.1007/s10653-024-02132-x

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© The Author(s) 2024

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Fig. 2 — Differences in fits of mean annual measured value of radon concentration in a tourist facility (cave) to values estimated using correction factors k_1m. Explanation: k_1ma—monthly correction factor for naturally ventilated facilities well insulated from the atmosphere, k_1mb—monthly correction factor for non-insulated facilities, k_1mc—averaged monthly correction factor for underground facilities, colours of legend and bars are the same, for bars used a colour blur