Starting with the fluctuating Gunn-Peterson approximation applied to the smoothed total density field in real-space, and progressing through redshift-space with no thermal broadening, redshift-space with thermal broadening and hydrodynamicaly simulated baryon fields, we investigate how approximations found in the literature fare.

[W]ipe thou thine eyes, haue comfort, / The direfull ſpectacle of the wracke which touch'd / The very vertue of compaſſion in thee: / I haue with ſuch prouiſion in mine Art / So ſafely ordered, that there is no ſoule / No not ſo much perdition as an hayre / Betid to any creature in the veſſel / Which thou heardſt cry, which thou ſaw'ſt ſinke: […]

Yossarian walked out of the office and down the stairs into the dark, tomblike street, passing in the hall the stout woman with warts and two chins, who was already on her way back in.

This assimilates them more nearly to the natural conditions when the hen nestles her chicks on the earth, whilst the warmth is given chiefly over their backs.