This function extracts the selected quantity from the fitted object
and spatially smooths it using Smooth.ppp.
The result is a pixel image or a list of pixel images.
References
Baddeley, A. (2017) Local composite likelihood
Baddeley, A., Rubak, E. and Turner, R. (2015) Spatial Point Patterns: Methodology and Applications with R. Chapman and Hall/CRC Press.