Non-isotropic clumping can also favor ÒsidewaysÓ escape, and thus suppression of the bluest and reddest photons, if the clumps are oblate. This makes lines more symmetric.
The Venetian Blind Model...

| Oblate clumps might be expected from the line-force instability, since it is a radial forceÉ
| On the other hand, prolate structures might be expected to develop from classical plasma two-fluid instabilities (Rayleigh-Taylor; Richtmeyer-Meshkov)