,0); \draw[line width =1mm](0 , -0.5) - -(2 , -0.5); \draw[ultra thin ](0,-1)--(2,-1); \draw[very thin ](0 , -1.5) - -(2 , -1.5); \draw[thin ](0,-2)--(2,-2); \draw[semithick ](0 , -2.5) - -(2 , -2.5); \draw[thick ](0,-3)--(2,-3); \draw[very thick ](0 , -3.5) - -(2 , -3.5); \draw[ultra thick ](0,-4)--(2,-4); \draw[double ](0 , -4.5) - -(2 , -4.5); \draw[double=red ](0,-5)--(2,-5); \draw[double distance =2pt](0 , -5.5) - -(2 , -5.5); \draw[line width =1mm , opacity =.6](0 , -6) - -(2 , -6); \end{ tikzpicture } 5/22