First detection of X-ray polarization from the long-period X-ray pulsar 4U 1954+319

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Table 3.

Parameters of the RVM geometric solutions for binned and unbinned analyses.

Parameter	Binned		Unbinned
	Solution 1	Solution 2
i_p (deg)	$101_{- 8}^{+ 11}$ $Mathematical equation: $ 101^{+11}_{-8} $$	$145_{- 14}^{+ 13}$ $Mathematical equation: $ 145^{+13}_{-14} $$	$144_{- 15}^{+ 14}$ $Mathematical equation: $ 144_{-15}^{+14} $$
θ (deg)	$68_{- 7}^{+ 5}$ $Mathematical equation: $ 68_{-7}^{+5} $$	$47_{- 17}^{+ 15}$ $Mathematical equation: $ 47_{-17}^{+15} $$	$49_{- 18}^{+ 16}$ $Mathematical equation: $ 49_{-18}^{+16} $$
χ_p (deg)	16 ± 8	$139_{- 12}^{+ 13}$ $Mathematical equation: $ 139^{+13}_{-12} $$	$138_{- 12}^{+ 10}$ $Mathematical equation: $ 138_{-12}^{+10} $$
ϕ₀	$0 . 47_{- 0.02}^{+ 0.03}$ $Mathematical equation: $ 0.47_{-0.02}^{+0.03} $$	0.75 ± 0.03	0.76 ± 0.02

Notes. Position angle χ_p = 139° is equivalent to −41° under the 180° modulo; other equivalent representations follow the same periodicity.

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