Total biological dose rate (i.e. the sum of radiation dose rates by muons, electrons, and neutrons, in mSv/yr) as a function of magnetospheric shielding. Bold dash-dotted line: planet with an atmospheric depth of 1036 g/cm² (i.e. an Earth-like atmosphere with a surface pressure of 1033 hPa). Bold dashed line: planet with an atmospheric depth of 100 g/cm² (i.e. a surface pressure of 97.8 hPa). Vertical line (shown as a guide for the eye): ℳ = 1.0 ℳ_⊕. Horizontal lines (shown for comparison): Total biological dose rates for the case ℳ = 0 (upper dashed and upper dash-dotted horizontal line) and ℳ = 1.0 ℳ_⊕ (lower dashed and lower dash-dotted line). Circle: Earth.