Fig. S7.

Turbulent line broadening. The measured argon spectral line at 461 nm at 3 cm from the carbon foil target for colliding jets (solid red line) and a single jet (solid blue line). A PrismSPECT calculation for an ion density of $1.6\times {10}^{17}$ cm⁻³ and an electron temperature of 3.5 eV is also shown (dashed black line).