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\label{fig:SpockCriticalCurves}  Locations of the lensing critical curves relative to the positions of  the two \spock sources. Panel (a) marks the \spock locations on the  HST Frontier Fields near-infrared  image of the MACS0416 field in the F814W (I) band.  Panels b-f show magnification maps derived from the Kawamata, Jauzac,  Diego and Zitrin lens models. All are scaled so that white is $\mu=1$  and black indicates $\mu=1000$. field.  Panel (g) (b)  depicts a trace of the lensing critical curve near the \spock positions from the GRALE  model. The models shown in b, c model,  and d have separate critical curves  passing near to panels c-i show magnification maps for a source at  thetwo  \spock positions. Models in e, f redshift, scaled so that white is $\mu=1$  and g have a  single critical curve passing between the two transient locations. black is $\mu=10^4$.  The GLAFIC v3.1 model shown in (c) (i)  was defined with the requirement that multiple critical curves pass through the \spock locations  (Kawamata et al., in prep). All other panels present the model  realization that provides the best fit to the lensing constraints.