Figure 6: The IPIL results versus adjusted peak impulse level. The E-A-RCAL ISL fi xture data are plotted with solid lines and open symbols. The NIOSH ISL fi xture IPIL data are plotted with a dotted line and fi lled symbols. The impulse levels against which the data are plotted have been adjusted by the difference in the unoccluded peak level measured at the ear of the fi xture relative to the right ear of the NIOSH ISL fi xture