Detection horizons for multiwavelength detectors, e.g., SKA, VLA, EVLA, ALMA, HST, JWST, LSST, and Chandra. The horizontal dotted line shows the 100 GHz detection window for ALMA assuming a source located at z = 3. Similar to Figure 2, the dotted vertical lines are the characteristic times of 5 GHz and 100 GHz signals.