Mass-radius relations for our hybrid DD2-EV NJL8 EoSs for constant η₂ = 0.08 and varying η₄ = 0.0−30.0. Horizontal colour bands mark the current 2 M_⊙ constraints from high-precision mass measurement of high-mass pulsars, PSR J1614–2230 (red) by Demorest et al. (2010) and PSR J0348+0432 (blue) by Antoniadis et al. (2013). For comparison with DD2-EV, the mass-radius curve for the hadronic EoS DD2 is also shown (solid brown line). Furthermore, we show results from the mass-radius analysis of the millisecond pulsar PSR J0437–4715 by Bogdanov (2013), and constraints from the X-ray spectroscopic study of the thermally emitting isolated neutron star RX J1856.5–3754 by Hambaryan et al. (2014). (Colour online.)