div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Royal Air - In the world · 2020 12 22 · ISO 16890-2 Curve 2 Conditioned fractional efficiency E ISO 16890-4 Curve 3 Average fractional efficiency E Oso 16890-1 Curve 4 src=https:reader036vdocumentsusreader036viewer202208162261343e4fdfd10f4dd73b9b27html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: Royal Air - In the world · 2020 12 22 · ISO 16890-2 Curve 2 Conditioned fractional efficiency E ISO 16890-4 Curve 3 Average fractional efficiency E Oso 16890-1 Curve 4 src=https:reader036vdocumentsusreader036viewer202208162261343e4fdfd10f4dd73b9b27html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdiv