Merged (FPMA+FPMB) NuSTAR images obtained in increasing energy bands. Images are smoothed with a Gaussian kernel of r = 8 pixels and σ = 4 pixels. The position of PSR B1853+01 is marked by a black cross, while the position of a nearby source, 2CXO J185613.6+011207, is marked by a black X. Left: 4.0–10.0 keV image shows an extended emission that coincides with the position of PSR B1853+01, exhibiting a spindle-like shape tapering at both ends and a faint extended emission in the south. Regions used for spatially resolved spectral analysis are shown here. Pulsar spectra were extracted using the magenta circles of two different radii 18″/29″. Region A is similar to the outflow region, Region C is similar to the trail region and Region D is similar to part of the southern halo where one of the large antenna feature lies. The background region is shown by dashed green circle. Right: 10.0–20.0 keV image. The PSR+PWN system is detected up to energies of ∼20 keV.