Indicates which sideband a dual sideband spectrum represents SideBand
"
usb"
(for upper
sideband), "
lsb"
(for lower sideband), or "
lo"
(for offset from the local oscillator
frequency). When setting a new value, any of the strings "
lsb"
, "
usb"
, "
observed"
, "
image"
or "
lo"
may be supplied (case insensitive). The "
observed"
sideband is
which ever sideband (upper or lower) contains the central spectral position given by
attribute DSBCentre, and the "
image"
sideband is the other sideband. It is the sign of
the IF attribute which determines if the observed sideband is the upper or lower
sideband. The default value for SideBand is the observed sideband.