16110002 was a success- paper in draft stage (a) ccd image for a 500 mbar Ar fill showing the fluorescence created in the Ar gas. A shadow region is evident between the region where the Ar is viewed and the region where plasma from the expanding laser-driven plasma can be visible as it moves away from the gas cell window. In (b) shot at the same Ar gas pressure has the 218nm Sn layer replaced with 186nm Al and we can see that there is a dramatic drop in the emission of Ar K-α and virtual disappearance of K-β emission. The calibration scale is the same for both images. Sn drive Al drive Right: Line-out for 152 mbar gas fill and 748J energy. In this case we show the spectrum at z=0.5mm (orange curve) as well as a Cloudy simulation (dashed curve). In both cases, we have marked the positions of expected K-α lines from different ion stages. Below: The photo-ionisation parameter (flux/electron density) for 50 mbar case is nearly twice observed in previous experiments. Pressure scan