The dominant harmonic frequencies are sidebands of the PWM frequency and multiples thereof. This produces a sequence of frequency modulated sidebands. The resulting subcarrier sidebands is also known as "chroma" or "chrominance". Amplitude modulation of a carrier signal normally results in two mirror-image sidebands. All forms of modulation produce sidebands. Then, examining the chart shows this modulation index will produce three sidebands. This frequency modulates the VCO and produces FM sidebands commonly called "reference spurs". DSB-AM signals consists of the carrier and both upper and lower sidebands. The sidebands carry the information transmitted by the radio signal. By sequential imaging of frequency sidebands, the issue of fringe counting has been alleviated. Carbon satellites and spinning sidebands should not be confused with impurity peaks. The sidebands can be used to improve signal reception. A very common application of EOMs is for creating sidebands in a monochromatic laser beam. Thus the upper and lower sidebands are summed. The FM bandwidth is wider because of the many sidebands.