指定等高线云图中某一区域显示指定透明颜色

huangzhiye

xj=(623 :12.5 : 748)
yi=(-3 : 1: 0)
AA= [22.82, 22.15, 21.69, 21.58, 21.93, 22.59, 22.74, 21.85, 20.60, 19.86, 20.34 ;
27.81, 26.77, 25.66, 24.85, 24.63, 25.09, 25.46, 25.08, 24.31, 23.86, 24.64 ;
38.45, 36.88, 34.71, 32.63, 31.40, 31.51, 32.42, 33.50, 34.58, 35.61, 36.53 ;
34.32, 34.74, 36.06, 37.76, 39.32, 40.42, 41.25, 42.06, 42.85, 43.55, 44.07]
BB=[ 0.1288, 0.1246, 0.1217, 0.1210, 0.1232, 0.1273, 0.1283, 0.1227, 0.1148, 0.1103, 0.1132 ;
0.1914, 0.1711, 0.1220, 0.0664, 0.0259, 0.0144, 0.0269, 0.0597, 0.1059, 0.1483, 0.1507 ;
-0.1191, -0.1026, -0.0676, -0.0219, 0.0175, 0.0330, 0.0370, 0.0447, 0.0534, 0.0581, 0.0563 ;
-0.2062, -0.1822, -0.1269, -0.0717, -0.0339, -0.0184, -0.0151, -0.0161, -0.0188, -0.0214, -0.0217]

a=[21 22 23 24 25 27 29 30 32 34 35 36 37 40 42 44]
[C,h]=contour(xj,yi,AA,30, 'k')% 绘制等高线，黑白
set(h,'ShowText','on','LevelList',a)%设定等高线的值
hold on%
[C,h]=contour(xj,yi,BB,3)
set(h,'ShowText','on','LevelList',0)%设定等高线的值

等高线分两个部分，AA显示为等高线，BB中小于等于0 的区域（等高线上侧）显示为某种颜色的透明阴影。不知道透明阴影如何设置？另外，如何调整 等高线上、坐标轴上 的标注字体及字号大小？