# RELEASE NOTES
## spatstat 1.53-2
### 08 October 2017
We thank Christophe Biscio and Rasmus Waagepetersen for contributions.
### OVERVIEW
* Correction to 'lohboot'
* Improvements to ppm and update.ppm
* Bug fixes and minor improvements.
* Nickname: "Quantum Entanglement"
### NEW FUNCTIONS
* fitin.profilepl
Extract the fitted interaction from a model fitted by profile likelihood.
### SIGNIFICANT USER-VISIBLE CHANGES
* ppm.ppp, ppm.quad
New argument 'clipwin'
* update.ppm
For the case 'update(model, X)' where X is a point pattern,
if the window of X is different from the original window,
then the model is re-fitted from scratch (i.e. use.internal=FALSE).
* plot.leverage.ppm
A contour line showing the average value of leverage
is now drawn on the colour ribbon, as well as on the main image.
New argument 'args.contour'.
### BUG FIXES
1. lohboot
Implementation was completely incorrect.
[Spotted and fixed by Christophe Biscio and Rasmus Waagepetersen.]
Fixed.
2. update.ppm
Did not always work correctly with formulae that included 'polynom()' terms.
Fixed.