ECHO1D: update to version 1.2
The package ECHO1D is updated to version 1.2. The algorithm is changed to avoid overflow errors for high conductive materials. The width of high conductive layer should be comparable with skin depth.
The package ECHO1D is updated to version 1.2. The algorithm is changed to avoid overflow errors for high conductive materials. The width of high conductive layer should be comparable with skin depth.