yea.. different factors.. and there isnt such a thing 90 bjsl... if its 90 then it will always hit you.
illl give u few factors as example:
60 bjsl 0 degrees wind (->, tail wind) factor is 0.74
70 bjsl 0 degrees wind (->, tail wind) factor is 0.62
80 bjsl 0 degrees wind (->, tail wind) factor is 0.566
and if u asked about 90 bjsl maybe u duno what bjsl means.. bjsl is angle adjust..
means that when wind is null u use the same angle for different distances. for example angle 70.. for 0.5sd u use 2.08 and for 1sd u use 2.98. but when the wind isnt null you still use the same powers but with different angles (you try to get over the wind effect by changing the angle)
and like i said.. angle 70 factor for -> wind is 0.62 then for 1sd u do
70+(0.62*20)
u get 82.4 (<- angle)
and u use 2.98 power..
and for angle 90.. on null wind every power u use u will hit urself... so with 90 bjsl chart u will change the angle but will still hit urself.. get it?