[amibroker] how do I add quotes to fix a gap

["Syed Farhan Ahmed" <syed_farhan_2k@xxxxxxxxx>]

i updated my quotes from on 21st. for some reason i couldnt update on 
20th. so my charts directly jump from 17th to 21. theres a gap at the 
20th in my charts nothing seems to work. what do i do and also plz 
tellme the settings foe amibroker quotes download








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