Unfortunately, gravitational redshifts between last scattering and today masks the signature in the temperature anisotropy.
Polarization provides a more direct test in that it can only be generated through scattering.
The large angle polarization reflects fluctuations near the horizon at last scattering and so may provide a direct window on such causal, non-inflationary models of structure formation. One must be careful however to separate scalar, vector and tensor modes whose different large angle behaviors may obscure the issue. Let us now illustrate these considerations with the specific examples introduced in the last section. Notice that scaling in the sources does indeed lead to near scale invariance in the large angle temperature but not the large angle polarization. The small rise toward the quadrupole for the tensor temperature is due to the contribution of long-wavelength gravity waves that are currently being generated and depends on how rapidly they are generated after horizon crossing.