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PlotLabel with assigned variables *and* on several lines


Hello.  

By searching the archives I found how to write variables with
specific values.  E.g., the following examples work:

    In[253]:= a=1;b=2; Plot[ Sin[x],{x,0,1},PlotLabel->"a=" <> ToString[a] "b=" <> ToString[b] ]

    In[254]:= a=1;b=2; Plot[ Sin[x],{x,0,1},PlotLabel->SequenceForm ["a=",a,"b=",b]]


Then I also found how to write a label on several lines:

    In[256]:= Plot[ Sin[x],{x,0,1},PlotLabel->"2 \n lines"]


But I did not find or succeed in combining the two.  E.g., those do
not work:

    In[255]:= a=1;b=2; Plot[ Sin[x],{x,0,1},PlotLabel->"a=" <> ToString[a] \n "b=" <> ToString[b] ]

    Syntax::sntxf: "a=1;b=2; Plot[ Sin[x],{x,0,1},PlotLabel->"a=" <> ToString[a"
     cannot be followed by "]\n"b=" <> ToString[b] ]".

    In[264]:= a=1;b=2; Plot[ Sin[x],{x,0,1},PlotLabel->SequenceForm["a=",a,\n" b=",b]]

    Syntax::com: Warning: comma encountered with no adjacent expression; the
	 expression will be treated as Null. 


    Syntax::sntxf: "a=1;b=2; Plot[ Sin[x],{x,0,1},PlotLabel->SequenceForm ["a=",a"
	 cannot be followed by ",\n"b=",b]]".


    In[264]:= a=1;b=2; Plot[ Sin[x],{x,0,1},PlotLabel->SequenceForm["a=",a] \n SequenceForm["b=",b]]

    Syntax::sntxf: "a=1;b=2; Plot[ Sin[x],{x,0,1},PlotLabel->SequenceForm["a=",a]"
	 cannot be followed by " \n SequenceForm["b=",b]]".


Is there a way to achieve this goal?

Thanks in advance,
AC


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