function [pcolor] = loadcolor4
    pcolor = [];

    % 精选的四种颜色，充分区分且美观
    pcolor.skyblue = [0.35, 0.70, 0.90];    % 天蓝色
    pcolor.coral = [1.00, 0.50, 0.45];      % 珊瑚色
    pcolor.lavender = [0.70, 0.50, 0.90];   % 薰衣草紫
    pcolor.mustard = [0.89, 0.66, 0.20];    % 芥末黄
 