Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_plot_topo”.

  FT_PLOT_TOPO interpolates and plots the 2-D spatial topography of the
  potential or field distribution over the head
 
  Use as
    ft_plot_topo(x, y, val, ...)
 
  Optional arguments should come in key-value pairs and can include
    'gridscale'     = scalar, number of points along both directions for interpolation (default = 67)
    'datmask'       = vector of same dimensions as val
    'mask'          = cell-array with line segments that forms the mask (see FT_PREPARE_LAYOUT)
    'outline'       = cell-array with line segments that for the outline (see  FT_PREPARE_LAYOUT)
    'isolines'      = vector with values for isocontour lines (default = [])
    'interplim'    = string, 'electrodes' or 'mask' (default = 'electrodes')
    'interpmethod'  = string, 'nearest', 'linear', 'natural', 'cubic' or 'v4' (default = 'v4')
    'style'         = can be 'surf', 'iso', 'isofill', 'surfiso', 'imsat', 'imsatiso', 'colormix'
    'clim'          = [min max], limits for color scaling
    'shading'       = string, 'none', 'flat', 'interp' (default = 'flat')
    'parent'        = handle which is set as the parent for all plots
    'tag'           = string, the name assigned to the object. All tags with the same name can be deleted in a figure, without deleting other parts of the figure.
 
  It is possible to plot the object in a local pseudo-axis (c.f. subplot), which is specfied as follows
    'hpos'          = horizontal position of the lower left corner of the local axes
    'vpos'          = vertical position of the lower left corner of the local axes
    'width'         = width of the local axes
    'height'        = height of the local axes
    'hlim'          = horizontal scaling limits within the local axes
    'vlim'          = vertical scaling limits within the local axes
 
  See also FT_PLOT_TOPO3D, FT_PLOT_LAY, FT_TOPOPLOTER, FT_TOPOPLOTTFR