Background: Early HDTV commercial experiments, such as NHK's MUSE, required over four times the bandwidth of a standard-definition broadcast. Despite efforts made to reduce analog HDTV to about twice the bandwidth of SDTV, these television formats were still distributable only by satellite.
Question: Efforts were made to reduce analog HDTV to how much of the bandwith of SDTV?
Answer:<extra_id_0>.
<extra_id_0> about twice<extra_id_1>