I wrote:
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if $map is your map object than the lines below would set the extent of the
reference map:
$map->reference->set('minx',-180)
$map->reference->set('miny',-180)
$map->reference->set('maxx',180)
$map->reference->set('maxy',180)
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It should be:
$map->reference->extent->set('minx',-180)
$map->reference->extent->set('miny',-180)
$map->reference->extent->set('maxx',180)
$map->reference->extent->set('maxy',180)
sorry
erik
