A collapsed spectrum of the cube displayed in the upper-left viewer automatically appears in the 1D spectrum viewer, using the Maximum collapse method. The collapse method can be changed in the :guilabel:`Viewer` tab of the |icon-settings-sliders| icon in the spectrum viewer. Additional spectra can be loaded into the spectrum viewer, as detailed in the linked documentation below.
.. seealso::
:ref:`Displaying Spectra (Specviz) <specviz-displaying>`
Documentation on displaying spectra in a 1D spectrum viewer.
There is one important difference when using the API to access Specviz from within Cubeviz.
The functionality of the :class:`jdaviz.configs.specviz.helper.Specviz` API can be accessed in Cubeviz via
the ~jdaviz.configs.cubeviz.helper.Cubeviz.specviz attribute, e.g. cubeviz.specviz.get_spectra().