You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: topoplot.m
    path of file: ./repos/erplab/studio_functions/Functions/EEGLAB/Scalp
    
    the code of the file until where you have to start completion: % topoplot() - plot a topographic map of a scalp data field in a 2-D circular view 
%              (looking down at the top of the head) using inte
    
function [handle,Zi,grid,Xi,Yi] = topoplot(Values,loc_file,varargin)

%
%%%%%%%%%%%%%%%%%%%%%%%% Set defaults %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
icadefs                 % read defaults MAXTOPOPLOTCHANS and DEFAULT_ELOC and BACKCOLOR
if ~exist('BACKCOLOR')  % if icadefs.m does not define BACKCOLOR
   BACKCOLOR = [.93 .96 1];  % EEGLAB standard
end