How are xenon fluorides `XeF_2, XeF_(4)` and `XeF_(6)` obtained ?

Explanation

`underset("excess")(Xe(g) + F_(2)(g) overset(673 K)underset(1 bar) to XeF_(2)(s)`
`Xe(g) + underset(1:5 "ratio") (2F_(2)) (g) overset(873 K)underset(7 bar) to XeF_(4)(s)`
`Xe(g) + underset(1:20 "ratio")(3F_(2)) overset(60-70 "bar")underset(573 k) to XeF_(6)(s)`