When requesting interface binary file, which consists of a number of useful data such as pressure/friction_energy, etc that can be contour plotted, LS-DYNA by default outputs these variables for ALL segments included in the SINGLE SURFACE contact. Visualizing the output can be tedious since it involves recursive blanking to expose the inner regions of interest in the case of a large model. The recommended approach in such cases is the use of multiple FORCE_TRANSDUCER (with SPR=1) with selected regions of interest defined using either SET_PART_LIST or SET_SEGMENT entities that allows easy viewing of interior regions.