Postscript Version
at70a.txt Nzeyimana (1991) [80] P=26.7 kPa, ER=0.8, 50% Ar+CF4
at70b.txt Nzeyimana (1991) [80] P=26.7 kPa, ER=1, 50% Ar+CF4
at70c.txt Nzeyimana (1991) [80] P=26.7 kPa, ER=1.2, 50% Ar+CF4
at189.txt Lefebvre (1993) [60] P=26.7 kPa, ER=1, 50% Ar+CF3H