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Xset.cosmo ⚬｜docu｜1st｜20251021205753-00-⌔

XspecSettings — PyXspec 2.1.5 documentation#xspec.XspecSettings.cosmo

property cosmo

Get/Set the cosmology values.

Get: Returns a tuple of floats containing (H0, q0, l0), where
  • H0 is the Hubble constant in km/(s-Mpc),
  • q0 is the deceleration parameter, and
  • l0 is the cosmological constant.

Set: Enter a single string containing one or more of H0, q0, l0.

Examples:

Xset.cosmo = "100"  # sets H0 to 100.0
Xset.cosmo = ",0"   # sets q0 to 0.0
Xset.cosmo = ",,0.7"  # sets l0 to 0.7
Xset.cosmo = "50 .5 0." # sets H0=50.0, q0=0.5, l0=0.0

Printed 2026-06-28.

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