From the link https://fyers.in/margin-calculator/equity-margin/, I can see the margin provided by Fyers for all the equity stocks. It seems stocks like acc, dabur, mrf, powergrid has margin multiplier of 17.9 but stocks like reliance has 14.7, hdfc has 11.6, axisbank has 7.5. Why is this the case? It seems reliance, hdfc should have more margin than acc, dabur? Is the margin provided different across brokers or fixed by exchange?