def deep(symbol=None, token='<STR_LIT>', version='<STR_LIT>'):
_raiseIfNotStr(symbol)<EOL>if symbol:<EOL><INDENT>return _getJson('<STR_LIT>' + symbol, token, version)<EOL><DEDENT>return _getJson('<STR_LIT>', token, version)<EOL>
DEEP is used to receive real-time depth of book quotations direct from IEX.
    The depth of book quotations received via DEEP provide an aggregated size of resting displayed orders at a price and side,
    and do not indicate the size or number of individual orders at any price level.
    Non-displayed orders and non-displayed portions of reserve orders are not represented in DEEP.

    DEEP also provides last trade price and size information. Trades resulting from either displayed or non-displayed orders matching on IEX will be reported. Routed executions will not be reported.

    https://iexcloud.io/docs/api/#deep

    Args:
        symbol (string); Ticker to request
        token (string); Access token
        version (string); API version

    Returns:
        dict: result