That is nice, thanks @Andrew_Malton! And thanks to @monasteryliturgist for posting it. When I saw the original, it looked too difficult. But having downloaded the mxl and now listened to some YouTube recordings, it's lovely.
Singable intervals (steps, third, fifth), enough repetition to make it easy to pick up. The modern notation has sixteenth (semiquaver) decorations which are not in the picture posted where for example 'viscera' (16ths & 8ths) and 'marie'(8ths) use the same punctum inclinatum. So @tomjaw would you just not render anything less than an 8th? For my little group, I'd stick to the modern notation to keep the decorations.
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