Figure 3
Changes of fractional concentration (%) of oxygen (O2) and carbon dioxide (CO2) during breathing experiments into the air pockets surrounded by snow with different properties (n = 35). Δ max indicates difference from baseline to maximum value and Δ min difference to minimum value. The colour bar indicates density (kg/m3) of the snow adjacent to the cavity. The area of the circles denotes the standard deviation (SD) of the penetration resistance 20 cm above and below the cavity. The markers in the circles indicate the measurement series: + (test series 1); ● (test series 2), and × (test series 3).
