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Fabulous image Marcus! I am amazed at how much detail your TOA can get. Amazing.
As far as a bit of red in the lower left - there is the start of some small amounts of Ha that builds as you go further to the left. That is Barnards Loop, but where you have caught it it is very slight indeed as it is the last remnants of Barnards Loop by the time you reach M78.
A bit of Ha would pick up whatever there is there but its not much and probably not worth the effort. Or shooting at a totally dark site but again the red is more to the left and lower than your FOV.
Barnards Loops gets quite thick and heavy to the left of M78 but its about 3 to 5 of your FOVs before you'd get there.
Greg.
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