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for my $level1_ref (@{$report_config->{"levels"}->{"level"}}) {
   print...
}

<config>
    <levels name="a" target="29.6">
...
    <study id="19" name="u"        weight="0"    spec="p0f7=1" />
    <study id="62" name="v"        weight="0" />
</config>