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The forum has had a number of threads on these.
If you would like to understand what they are and their place in the cosmos you could employ the forum's search function to pull them up.
Not much point in covering old ground for the umpteenth time.
Your example has received some upgrades from its stock configuration which is a plus.
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Last edited by juvela; 10-16-18 at 06:57 PM.
Reason: spelling