Table 1. Experimental Text Conditionsa


Pressure Ratios	Reservoir Gas Composition	Gamma	c0 (m/s)	W (kg/mol)

250:1 to 15:1	Nitrogen	1.40	353	28
40:1 to 15:1	Helium	1.67	1002	4
250:1 to 100:1	Pseudogas	1.04	105	700

aHere Gamma is the isentropic exponent, c0 is the speed of sound in the reservoir, and W is the molecular weight of the reservoir gas. Also shown are the conditions assumed for a pseudogas, based on Kieffer [1981].