my %changes = ( "2006_01_01_00_00_00" => \@types0,
            "2006_02_03_19_00_00" => \@types1,
            "2006_03_03_09_00_00" => \@types2,
            "2006_04_14_22_00_00" => \@types3,
            "2006_07_07_22_00_00" => \@types4,
            "2006_07_20_19_00_00" => \@types5,
            "2006_08_10_20_00_00" => \@types6,
            "2006_10_17_21_00_00" => \@types7,
            "2006_11_06_23_00_00" => \@types8,
            "2006_11_27_20_00_00" => \@types9,
            "2006_12_18_21_00_00" => \@types10,
            "2007_03_19_20_00_00" => \@types11,
            "2007_05_09_20_00_00" => \@types12,
            "2007_08_06_16_00_00" => \@types13,
            "2007_09_09_08_00_00" => \@types14,
            );