Each effect that contributes to attenuation and dispersion depends on the optical wavelength. Scattering and absorption are major causes of the attenuation of sunlight radiation by the atmosphere. Matching the time constants makes the attenuation independent of frequency. Damping attenuation (symbol ) is measured in nepers per second. Attenuation coefficients vary widely for different media. Properly designed wind screens produce negligible treble attenuation. The use of the term "molar absorptivity" for molar attenuation coefficient is discouraged. The oscillation decays at a rate determined by the attenuation . This results in minimal outdoor to indoor noise attenuation. It is regulated by feedback inhibition in the form of transcriptional attenuation. The statistics of the random attenuation are decided by previous measurements or physical simulations. Another protein important in Akt attenuation is Carboxy Terminal Modulator Protein (CTMP). Accordingly, its thickness depends on the extent of light attenuation in the water column. This can be determined using an exponential model of ultrasound attenuation. The two resistors form a weighted parallel summer incorporating both the attenuation and summation.