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+.PS
+# ex03.m4
+cct_init
+circlerad = 0.35/2
+define(`elen_',`dimen_')
+del = linewid*0.6
+
+ "$u_k$" above
+ line
+{
+ arrow right_ del
+B0: circle "$b_0$"
+ arrow right linewid/2
+S: circle "$\sum$"
+ line right 2*circlerad + del + S.w.x-B0.e.x
+ {arrow ; "$y_k$" above }
+ down_
+ delay
+ {line left_ del ; circle "$-a_1$" ; arrow from last circle to S chop}
+ line dashed down_ del
+ delay
+ {line left_ del ; circle "$-a_n$" ; arrow from last circle to S chop}
+}
+ down_
+ delay
+ {line right_ del ; circle "$b_1$" ; arrow from last circle to S chop}
+ line dashed down_ del
+ delay
+ {line right_ del ; circle "$b_n$" ; arrow from last circle to S chop}
+.PE