Over the last year, the annualized volatility of the S&P 500 and TSLA were, respectively. 15.42% and 38.78%. TSLA's idiosyncratic volatility, relative to the market, was 34.36%. If you were to run the following regression:

Rtsla,t - Rf = a + (Rs&p,t - Rf,t) + Etsla,t

what (slope coefficient) would you obtain?