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  1. or download this
    'I' => {
     $a => [4,10,200],
     $b => [75,350],
. . .
  2. or download this
    'I' => {
    4 => $a,
...
    75 => $b,
    350 => $b,
. . .
  3. or download this
    'I' => {
     $a => [10,200],
     $b => [75,200,350],
. . .
  4. or download this
    $interval = 500;
'I' => {
     $a => [200,500,800],
. . .