Regularization in the Fourier index domain is more versatile and easier to design, and the consequences are easier to understand physically. For example, phases of components can be fixed at 0˚ or 180˚ to accommodate negative intensities that arise in some measurements. Amplitudes in the Fourier index domain might be extended or damped at high indices using a function that conveys the resolution appropriate to the measurement. Resolution might even be chosen specifically for individual rate components if appropriate prior knowledge is available. The use of Equation (2.23) could also be examined in this context. From the sloppy model perspective, the proposed regularization protocol achieves desired behavior of sloppy parameter combinations in the spectral domain by imposing a smooth decay and eventual full zeroing of components in the Fourier index domain.