message OrderBookDeltaUpdate {

// Aggregation modulus is a value which all bids and asks in this particular

// OrderBookUpdate are divisible by. E.g. could be 1 (no aggregation), 5, 10,

// 50, 100, etc. Exact possible values are set for each market individually.

float aggregationModulus = 3 ;

string aggregationModulusStr = 4 ;

int32 seqNum = 5 ;