Thumbnail question

From this link;
https://graviteti.com/wp-content/themes/wp-clear_basic%20v2.0/scripts/timthumb.php?src=https://graviteti.com/wp-content/uploads/2011/07/bota-islame-graviteti-37-150×150.jpg&w=150&h=150&zc=1

Can someone tell me, where this command is being given:
&w=150&h=150&zc=1

I want to change this value’s default (to something like 100×100)
..I really need this!