Snapshots of the blowout jet of 2008 September 20 showing that during the production of the X-ray jet much cooler ( T ~ 80, 000 K) plasma erupted from the jet's base and ejected along the spire of the X-ray jet. The upper five snapshots are nearly co-temporal in the jet's maximum phase; the bottom two are 10 minutes later, in the decay phase. Top: XRT image of the jet and its surroundings in the northern polar coronal hole. This is a larger sub field of view taken from the same frame of the XRT movie as the fifth frame of Figure  6. It shows the jet when the jet's two non-standard features, the front strand of the spire and the transiently bright interior of the base arch, are near their maximum brightness and size. Upper middle left: EUVI B 195 Å image of about the same heliographic area viewed in the top image. Upper middle right: EUVI A 195 Å image of about the same heliographic area. Lower middle left: EUVI B 304 Å image of nearly the same area viewed in the EUVI B 195 Å image above it. Lower middle right: EUVI A 304 Å image of nearly the same area viewed in the EUVI A 195 Å image above it. Bottom left: EUVI B 304 Å image of the same area viewed in the EUVI B 304 Å image above it. Bottom right: EUVI A 304 Å image of the same area viewed in the EUVI A 304 Å image above it. In each frame, the slanted arrow points to the base of the jet, the horizontal arrow points to the location of the dim arch seen inside the limb near the west edge of the top image, and the universal time is shown on the right, above the limb. The angle of separation from Earth was 39° for STEREO A and 35° for STEREO B.