  We consider the spectrum of primordial fluctuations produced by inflationary
models where the inflaton potential is the sum of two exponential terms. A wide
range of spectra result, with the only constraint being that the scalar
spectrum must have more tilt than the tensor spectrum. This model can mimic the
spectra of most inflationary models, as well as producing combinations of
scalar and tensor perturbations not found in common varieties of slow-rolling
inflation.
