JUL series Day-9 Nifty=5306 (-39)
In this JUL series we have 5 UP ,1 NO change and 3 DOWN days as follows:
UNUUUDDUD
Now the Expiry zone stands at (5100~5400).
OI is rather mixed in both CALL window & in PUT window.
The significant additions in this zone ,are indicated in the chart.
[Individual strikes showed different values on further expansion,in NSE site]
5500PE has total OI at 8.9L and 4900CE has total OI at 5.5 L.
The chances of PUT window ,further expanding are more.This will happen only
if NIFTY moves upwards.
Gamma
The option's gamma is a measure of the rate of change of its delta.
The gamma of an option is expressed as a percentage and reflects
the change in the delta in response to a one point movement of the
underlying stock price.
Like the delta, the gamma is constantly changing, even with tiny
movements of the underlying stock price. It generally is at its peak
value when the stock price is near the strike price of the option
and decreases as the option goes deeper into or out of the money.
Options that are very deeply into or out of the money have gamma
values close to 0.
(courtesy:theoptionguide.com)