An analysis by the Author Earnings website (an aggregator and
analyser of eBook sales
data) identified that, outside the world of traditional publishing, authors who were self - published, independently published or published directly by Amazon imprints, had sold more than 260 million eBooks worth more than US$ 850 million in the US in 2016.
Becks rather important comments: The Giessen
data He conducted 64 000 measurements in 4 differnet altitudes using a high precision gas
analyser invented by P Schuftan, Accuracy: 1,5 %.