[ccgreg]

> We report detection of CN emission and also detect numerous Ni I lines while Fe I remains undetected, potentially implying efficiently released gas-phase Ni.

Where does it say there is zero iron? This is an upper bound, not zero.

[galacticaactual]

"FE I remains undetected"

Remains Undetected. Pretty crystal clear.

[ccgreg]

No. Undetected iron and zero iron are different. Source: astronomer.

[galacticaactual]

"Undetected" is not an "upper bound." Source: computer scientist.

[ccgreg]

Undetected means you can compute an upper bound, based on the performance of your instrument. Again, these are undergraduate level concepts.

[galacticaactual]

Again, you’re being obtuse but well leave it there. Good day.