mppm,
  compute spatial trend or conditional intensity surface of the model,
  in a form suitable for plotting, and (optionally) plot this
  surface.## S3 method for class 'mppm':
plot(x, ..., trend = TRUE, cif = FALSE,
                  how="image")mppm.
    An object of class "mppm".plot.ppm or
    plot.listof controlling the plot.TRUE, the spatial trend surface will be produced.TRUE, the conditional intensity surface will be
    produced.NULL.plot method for the class "mppm"
  of point process models fitted to multiple point patterns
  (see mppm).  It invokes subfits to compute the fitted model for
  each individual point pattern dataset, then calls
  plot.ppm to plot these individual models. These
  individual plots are displayed using plot.listof,
  which generates either a series of separate plot frames or an
  array of plot panels on a single page.
plot.ppm,
  mppm,
  plot.listof