Get current level 2 data as a Numpy array

Returns a Numpy array with values at indices:

• 0: Trade volume (in the last step)

• 1: Bid touch price

• 2: Ask touch price

• 3: Bid total volume

• 4: Ask total volume

the following 40 values are data for each price level below/above the touch

• Bid volume at level

• Number of buy orders at level

• Ask volume at level

• Number of sell orders at level