Well, if I can 'decipher' your . . .
english, I think you are asking "what the mixture % at -7F and -24F"??
If so, -7F is apx 38% and -24F is apx 48%.
Check my web page, MENU 17 for a picture of a hygrometer calibrated in degrees (F and C) vs mixture percentage.
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Regards . . . . JimF
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'94 S500 Cpe
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