Temperature calibration measurements for the basalt aggregates at ambient pressures p ∈ [24, 405] Pa and laser driver current I ∈ [7, 27] A. The temperature is measured with a thermal camera assuming an emissivity ɛ = 0.72 for basalt (Golden 2013). The function , with fit parameters T₀, T_∞ (p₁), α, I_Δ and I₀, is fitted to the data and is used to determine the temperatures for the experimental runs.