Apparatus, including a flexible insertion tube having a distal end for insertion into a body cavity, a first sensor in the distal end configured to acquire a first signal from the cavity during a medical procedure, and a second sensor in the distal end configured to acquire a second signal from the cavity during the procedure. The interleaver may generate a lookup table, which is utilized to assign at least one binary bit of information, among a plurality of binary bits of information to be transmitted, to at least one of a plurality of spatial streams. The depth finder can be attached to any cross section of the line. By selecting and providing particular characteristics relative to the cross-sectional area of the dispensing orifice and the separation force profile, wipes which are loaded with an adhesive, tacky binder material can be dispensed one at a time, while minimizing clumping and fallbacks, and any tendency of the wipes to becoming stuck within the container body. A wide read head can also make the reading of data more reproducible when reading narrow tracks using swipe readers, where precise alignment is difficult to achieve. A part or all of each side of the terminal box includes an inclined surface.