Edit file ECT.BSE to appear like the data shown below. Paperboards can be assigned arbitrary material codes. However, Dflt-L and Dflt-M are reserved to specify a default linerboard and a default corrugating medium, respectively, and override the data stored in file DEFAULT.IPT.

Execute PPR and repeat Example 2.3 to observe the effect of changing the default materials. When only the basis weight of a material is specified, as for material liner, output is determined from properties of the default linerboard in file DEFAULT.IPT.