A system includes a heat exchange catheter line assembly configured to convey working fluid circulating to and from at least one heat exchange element on an intravascular heat exchange catheter. The constructions may contain semiconductor material pillars extending upwardly between dielectric regions, with individual pillars having a pair of opposing vertically-extending sides along a cross-section. In both processes the nitrogen-containing compound is selected from a nitrogen-containing heterocycle or a trialkylamine. The display pixel, the photoelectric sensor, and the second sensor may be located in the multifunctional pixel. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle.