Looks good. I would leave it at that but, perhaps for future reference, I couldn't resist a further tweak. :-) 
# ...
my %titles = (
  q{01} => q{First},
  q{02} => q{Second},
  q{03} => q{Third},
  q{04} => q{Fourth},
  q{05} => q{Fifth},
  q{06} => q{Sixth},
);
    
my @cmds;
for my $number (qw{01 02 03 04 05 06}){
  my $cmd = build_command($number, $titles{$number}, %args);
  push @cmds, $cmd;
}
# ...

[download]
sub build_command {

  my $num = shift;    
  my $title = shift;
    
  my %args = @_;
  
  my $cmd = sprintf(
    qq{set title "The %s Indicator\n"},
    $title,
  );
  
  # ....

[download]
  ...
  ######################################
  $multiplot_title
  $cmds[0]
  $cmds[1]
  unset multiplot
  ...

[download]

In reply to Re^2: How to declare variables per loop by wfsp
in thread How to declare variables per loop by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.