$ perl 1174639.pl
$VAR1 = [
          {
            'blur_fwhm' => 4,
            'step' => 8,
            'iterations' => 20
          },
          {
            'step' => 6,
            'blur_fwhm' => 3,
            'iterations' => 20
          },
          {
            'blur_fwhm' => 2,
            'step' => 4,
            'iterations' => 10
          },
          {
            'blur_fwhm' => 1,
            'step' => 2,
            'iterations' => 10
          }
        ];