Tune shift with amplitude of the system. When the tune reaches resonant values, it can be unstable, and thus a tune-shift with amplitude can limit the stability region, or dynamic aperture. In classical mechanics, a simple example of a system with tune shift with amplitude is a pendulum. In accelerator physics, both the transverse and the longitudinal dynamics show tune shift with amplitude. A simple model of the transverse dynamics is of an oscillator with a single sextupole, it is referred to as the Hénon map. Another model for this case is the Standard Map. An important example is the typical case of distributed
Some Girls Are Bigger Than Others embrace," while Nick Kent wrote, "'Vicar In a Tutu' and 'Some Girls Are Bigger Than Others', sensibly restrained arrangement-wise, may well be lesser songs but, constructed within their rightful limitations, sound absolutely stunning". In Simon Goddard's track-by-track book "", Johnny Marr describes the song as "a beautiful piece of music", while the author writes, "Possessing one of his most alluring guitar melodies [...] if Marr's tune was heaven-sent, then it seemed very nearly blasphemous of Morrissey to christen it 'Some Girls Are Bigger Than Others' and bestow it with its notoriously frivolous lyric". "Some Girls Are Bigger Than Others" was