Table 1: Details of the quantum MOLSCAT cross section calculation parameters. $J_{1\rm up}({\rm HC_3N}) \leq 15$ (10 for He). Methods: CC, Close coupling, CS, Coupled states approx., IOS, Infinite Order Sudden approx.
$ \sigma_{J_1J'_1}(E)$, ${\rm HC_3N}$-para-${\rm H_2}$ collisions
$E_{\rm tot}\:\rm (cm^{-1})$ Energy step ( $\rm cm^{-1}$) Method
$0.3 \rightarrow 60$ 0.1 CC
$60 \rightarrow 110$ 10 CC
$40 \rightarrow 200$ 10 CS
$50 \rightarrow 800$ 10-100 IOS
$ \sigma_{J_1J'_1}(E)$, ${\rm HC_3N}$-ortho-${\rm H_2}$ collisions
$0\rightarrow 30 $ 1 CC
$ \sigma_{J_1J'_1}(E)$, ${\rm HC_3N}$-He collisions
$0\rightarrow 25 $ 0.1 CC
$25\rightarrow 100 $ 5 CC
$100\rightarrow 150 $ 10 CC

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