6,27.5,26.1,25.3,23.7, 22.7]\rplot(x,y,'k.','markersize',25)\ra=polyfit(x,y,1)\rt=1:1:14\rs=polyval(a,t)\rhold on\rplot(t,s,'r-','linewidth',2)\rgrid\r（万吨）\r（年份减去 2000）\r一号井水量模拟图线\r二号井：\r8\rx=1:1:9\ry=[21.5,15.9,11.8,8.7,6.5,4.8,3.5,2.6, 2.0]\rplot(x,y,'k.','markersize',25)\ra=polyfit(x,y,3)\rt=1:1:14\rs=polyval(a,t)\rhold on\rplot(t,s,'r-','linewidth',2)\rgrid\r（万吨）\r（年份减去 2000）\r二号井水量模拟图线\r三号井：\rx=1:1:9\ry=[ 27.9,25.8,23.8,21.6,19.5,17.4,15.5,13.3,11.2]\rplot(x,y,'k.','markersize',25)\ra=polyfit(x,y,1)\rt=1:1:14\rs=polyval(a,t)\rhold on\rplot(t,s,'r-','linewidth',2)\rgrid\r9\r（万吨）\r（年份减去 2000）\r三号井水量模拟图线\r四号井：\rx=2:1:9\ry=[ 46.2,32.6,26.7,23.0,20.0,18.9,17.5,16.3 ]\rplot(x,y,'k.','markersize',25)\ra=polyfit(x,y,3)\rt=2:1:14\rs=polyval(a,t)\rhold on\rplot(t,s,'r-','linewidth',2)\rgrid\r10
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