How to remove needless ranges from the pcolor map?

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Ji Eun Lee
Ji Eun Lee 2017-3-27
评论： KSSV 2017-3-27
I have three data - Lon(304x448), Lat(304x448), SIC(304x448)
And below is the code I used
lon=Lon(:);
lat=Lat(:);
x1=floor(min(lon));
x2=ceil(max(lon));
y1=floor(min(lat));
y2=ceil(max(lat));
lon1=[x1:0.05:x2];
lat1=[y1:0.05:y2];
[long,lati]=meshgrid(lon1,lat1);
sic=griddata(Lon,Lat,SIC,long,lati);
pcolor(lon1,lat1,sic)
shading flat
This way, the map looks like this
But it runs out the observation range.
Below is plotting the observation points on the picture 1.
What should I do to remove that range?

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