A simplified insulin pump allows type II diabetics to identify routine patterns in their daily lifestyle that provide a generally accurate typical pattern of activity and meals. The present invention is applicable in the field of etching items made from a material suitable for laser marking. The first collector includes a first doped well disposed in the substrate. Each document data including numeric values is indexed by indexing its text part with term frequencies, and by indexing its numeric-value part with the above-described numeric value indexing scheme. The pot bottom has at least one propellent gas inlet which opens into the pressure chamber. The fiber guide grooves have side walls including support projections configured to support, align, and optical couple the optical fibers to the waveguide cores, and adhesive recesses configured to define gaps between outer peripheral surfaces of the optical fibers and the fiber guide grooves so that the adhesive spreads in the gaps.