highly significantp < 0.01
The pressure ( p ) was kept at 0.1 MPa, with Xp = 0, as follows: Y S A E W = 7.49 + 0.044 x c + 0.88 x t + 0.59 x r + 0.0014 x c x t + 0.0053 x c x r − 0.016 x t x r − 0.00094 x c 2 − 0.097 x t 2 − 0.12 x r 2 The model was subjected to an analysis of variance, and the obtained multiple regression model was found to be highly significant ( p < 0.01).