def read_histogram(self):
resp = []<EOL>data = {}<EOL>command = <NUM_LIT><EOL>self.cnxn.xfer([command])<EOL>sleep(<NUM_LIT>)<EOL>for i in range(<NUM_LIT>):<EOL><INDENT>r = self.cnxn.xfer([<NUM_LIT>])[<NUM_LIT:0>]<EOL>resp.append(r)<EOL><DEDENT>data['<STR_LIT>']           = self._16bit_unsigned(resp[<NUM_LIT:0>], resp[<NUM_LIT:1>])<EOL>data['<STR_LIT>']           = self._16bit_unsigned(resp[<NUM_LIT:2>], resp[<NUM_LIT:3>])<EOL>data['<STR_LIT>']           = self._16bit_unsigned(resp[<NUM_LIT:4>], resp[<NUM_LIT:5>])<EOL>data['<STR_LIT>']           = self._16bit_unsigned(resp[<NUM_LIT:6>], resp[<NUM_LIT:7>])<EOL>data['<STR_LIT>']           = self._16bit_unsigned(resp[<NUM_LIT:8>], resp[<NUM_LIT:9>])<EOL>data['<STR_LIT>']           = self._16bit_unsigned(resp[<NUM_LIT:10>], resp[<NUM_LIT:11>])<EOL>data['<STR_LIT>']           = self._16bit_unsigned(resp[<NUM_LIT:12>], resp[<NUM_LIT>])<EOL>data['<STR_LIT>']           = self._16bit_unsigned(resp[<NUM_LIT>], resp[<NUM_LIT:15>])<EOL>data['<STR_LIT>']           = self._16bit_unsigned(resp[<NUM_LIT:16>], resp[<NUM_LIT>])<EOL>data['<STR_LIT>']           = self._16bit_unsigned(resp[<NUM_LIT>], resp[<NUM_LIT>])<EOL>data['<STR_LIT>']          = self._16bit_unsigned(resp[<NUM_LIT:20>], resp[<NUM_LIT>])<EOL>data['<STR_LIT>']          = self._16bit_unsigned(resp[<NUM_LIT>], resp[<NUM_LIT>])<EOL>data['<STR_LIT>']          = self._16bit_unsigned(resp[<NUM_LIT>], resp[<NUM_LIT>])<EOL>data['<STR_LIT>']          = self._16bit_unsigned(resp[<NUM_LIT>], resp[<NUM_LIT>])<EOL>data['<STR_LIT>']          = self._16bit_unsigned(resp[<NUM_LIT>], resp[<NUM_LIT>])<EOL>data['<STR_LIT>']          = self._16bit_unsigned(resp[<NUM_LIT:30>], resp[<NUM_LIT>])<EOL>data['<STR_LIT>']       = self._calculate_mtof(resp[<NUM_LIT:32>])<EOL>data['<STR_LIT>']       = self._calculate_mtof(resp[<NUM_LIT>])<EOL>data['<STR_LIT>']       = self._calculate_mtof(resp[<NUM_LIT>])<EOL>data['<STR_LIT>']       = self._calculate_mtof(resp[<NUM_LIT>])<EOL>data['<STR_LIT>']     = self._calculate_temp(resp[<NUM_LIT>:<NUM_LIT>])<EOL>data['<STR_LIT>']        = self._calculate_pressure(resp[<NUM_LIT>:<NUM_LIT>])<EOL>data['<STR_LIT>'] = self._calculate_period(resp[<NUM_LIT>:<NUM_LIT>])<EOL>data['<STR_LIT>']        = self._16bit_unsigned(resp[<NUM_LIT>], resp[<NUM_LIT>])<EOL>data['<STR_LIT>']             = self._calculate_float(resp[<NUM_LIT:50>:<NUM_LIT>])<EOL>data['<STR_LIT>']           = self._calculate_float(resp[<NUM_LIT>:<NUM_LIT>])<EOL>data['<STR_LIT>']            = self._calculate_float(resp[<NUM_LIT>:])<EOL>histogram_sum = data['<STR_LIT>'] + data['<STR_LIT>'] + data['<STR_LIT>']   +data['<STR_LIT>'] + data['<STR_LIT>'] + data['<STR_LIT>'] + data['<STR_LIT>']   +data['<STR_LIT>'] + data['<STR_LIT>'] + data['<STR_LIT>'] + data['<STR_LIT>']  +data['<STR_LIT>'] + data['<STR_LIT>'] + data['<STR_LIT>'] + data['<STR_LIT>'] +data['<STR_LIT>']<EOL>return data<EOL>
Read and reset the histogram. The expected return is a dictionary
        containing the counts per bin, MToF for bins 1, 3, 5, and 7, temperature,
        pressure, the sampling period, the checksum, PM1, PM2.5, and PM10.

        **NOTE:** The sampling period for the OPCN1 seems to be incorrect.

        :returns: dictionary