data(Plasma)An orthogonal arry, capable of supporting a linear model only. The factors are denoted by their units of measurement. They were W, the power applied to the cathode; mTorr, the pressure in the reaction chamber; cm, gap between anode and cathode; sscm, flow if the reactant gas. The three responses: Amin, etch rate; Pct, unifomity; sinpoly, selectivity.