google maps how can I zoom out by default? -


i created new google map , added few markers when include in code iframe starts zoom 17 , want zoomed out max (z=20). tried pass argument z=20 no result. suggestions? code:

<iframe width="425" height="300" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="https://maps.google.com/maps/ms?msa=0&amp;msid=204116165110023160774.0004d7aa572501051bc40&amp;ie=utf8&amp;ll=37.020098,-95.625&amp;spn=116.710475,270.527344&amp;t=m&amp;output=embed"></iframe>

you can when create map : 

var map = new google.maps.map(map, {         zoom: 20,         center: latlng,          maptypeid: google.maps.maptypeid.roadmap       });

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