Fig. 2. Application of the differentiated linearization (DL) method to the field data obtained in Exp. (a) 5L, (b) 8L, and (c) 6TI. The straight line was obtained by regression of the increasing linear part of the 
I/
vs. data.
Fig. 2. Application of the differentiated linearization (DL) method to the field data obtained in Exp. (a) 5L, (b) 8L, and (c) 6TI. The straight line was obtained by regression of the increasing linear part of the I/ vs. data.