Get current level 1 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

• 5: Bid touch volume

• 6: Number of buy orders at touch

• 7: Ask touch volume

• 8: Number of sell orders at touch