We show that the phase spaces of a large family of line operators in 4d
    Chern-Simons theory with $\text{GL}_n$ gauge group are given by Cherkis bow
    varieties with $n$ crosses. These line operators are characterized by
    Hanany-Witten type brane constructions involving D3, D5, and NS5 branes in an
    $\Omega$-background. Linking numbers of the five-branes and mass parameters for
    the D3 brane theories determine the phase spaces and in special cases they
    correspond to vacuum moduli spaces of 3d $\mathcal{N}=4$ quiver theories.
    Examples include line operators that conjecturally create T, Q, and L-operators
    in integrable spin chains.

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