  We demonstrate a High-Harmonic-Generation scheme which offers control over
the bandwidth of the spectral peaks. The scheme uses a vectorial two-color
driver with close central frequencies, generated by spectrally splitting a
linearly-polarized input femtosecond-duration laser pulse and subsequent
recombining the two halves after their polarizations are made cross-elliptical
and counter-rotating. This results in the generation of new emission channels
which coalesce into broad odd-integer HHG peaks, the bandwidth of each being
proportional to the frequency difference between the two colors, to the
harmonic order and inversely-proportional to the driver fields' ellipticities.
Peak-broadening to the extent that a supercontinuum is formed is also
demonstrated. This source will find use in HHG applications benefiting from
high-flux broadband extreme ultra-violet radiation, such as attosecond
transient absorption spectroscopy.
