frontal analysis - a form of chromatography where pure sample flows through the column; each component breaks through at a different time depending on its affinity for the adsorbent.

fronting - peak shape in which the front part of a peak (before the apex) in a chromatogram tapers in advance of the remainder of the peak. There is an asymmetric distribution with a leading edge. The asymmetry factor for a fronting peak has a value less than one. The opposite effect is tailing. Fronting is related to the shape of the adsorption isotherm.

gas chromatography (GC, GLC) - a form of chromatography where the mobile phase is gas.

Gaussian curve - a standard error curve, based on a mathematical function, that is a symmetrical, bell-shaped band or peak. Most chromatographic theory assumes a Gaussian peak.

See band broadening.