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\rput[l](1.2,1.9){\color{orange}$\vec{a}$}
\rput[l](3,3.5){\color{blue}$\vec{a}+\vec{b}$}
\rput[l](4,1.25){\color{red}$\vec{b}$}
\rput[1](2.0,-0.65){\color{orange}{$a_1$}} %%a1
\rput[1](-0.85,4){\color{orange}{$a_2$}} %%a2
\rput[1](5.0,-0.65){\color{red}{$b_1$}} %%b1
\rput[1](-0.85,1){\color{red}{$b_2$}} %%b2
\rput[1](7.2,-0.65){\color{blue}{$a_1+b_1$}} %%c1
\rput[1](-1,5){\color{blue}{$a_2+b_2$}} %%b2
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