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A function to linearly fit two independant variables to a dependent one. Input params: QS_Ser: The dependent variable QS (Surface heat storage). Pandas Series.QN_Ser: The first independent variable (Net all wave radiation). Pandas Series. dt: The time interval with which the rate of change of QN is calculated. Float (hours).
Returns: a1, a2 coefficients and a3 (intercept)