How many elliptical orbits are there in third Bohr’s orbit?

How many elliptical orbits are there in third Bohr’s orbit ? What was the purpose
of adding these elliptical orbits ?

  1. To explain the splitting of line spectra, Sommerfeld modified Bohr’s atomic model by adding elliptical orbits.
  2. Retaining the first of Bohr’s circular orbit as such, Sommerfeld added two elliptical orbits to Bohr’s third orbit.