Can you access value in multi-dimensional array in one swoop?

Using get_post_meta(), you can retrieve all meta fields in one query.

Example

$post_meta = get_post_meta( $post->ID );

When you var_dump, you see

array(1) {
  ["device_width"]=>
  array(1) {
    [0]=>
    string(4) "2.60"
  }
}

Is there a way to access the "2.60" variable without putting the second array into it's own variable?

I know you can do:

$device_width = $post_meta['device_width'];
echo $device_width[0];

But can I access the end variable in one swoop without creating a $device_width variable? (like how you do with objects - $object->item->single)