what is the difference between million sheets and quarter sheets in topographical maps

These sheets are called as million sheet topographical map or 1/M sheets. The 1/M sheets are again segmented into sixteen equal fragments of , and are in scale of 1:25000
The scale of the sheets in this series is 1 : 1,000,000. Quarter Sheet or Quarter Inch Map Each 4° × 4° sheet is sub-divided into 16 equal parts. The extent of each part or sheet is 1° of latitude and 1° of longitude.
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