Master template serving as a seed to the construction of a template bank, given by an exponential decay in frequency f₀ ≥ f(t) > f₁ over 0 ≤ t ≤ T (top panel). Time-slicing produces chirps of intermediate duration P ≪ τ ≪ T, where P denotes the characteristic period of the (candidate) signal of interest. Time-symmetric templates obtain by linear superposition with their time-reverse (right), realizing equal sensitivity for ascending and descending chirp-like signals. (Reprinted from van Putten et al. (2014a).) Illustration of the suppression of constant frequency input (lower panel) in the form of the application of butterfly filtering to unwhitened LIGO data (left). Lines such as shown in Fig. B.1 fail to correlate with butterfly templates, leaving a smooth and approximately white background noise (right). Note: reprinted from van Putten (2016).