PVC/MPL/M1 - Instrument failure after power outage

MPL was intermittently down for a few days before going completely down for ~17 days.  
When it came back online on 10/22, the background signals were too high. The instrument was 
replaced 20130123.

Ignore any data during this time period

• Bin number of first data. Tells where pretrigger timing ends and end of region
  for background data sampling laser_fire_bin(first_data_bin)
• Background signal, co-pol(background_signal_co_pol)
• Width of range-bins calculated from range_bin_time(range_bin_width)
• Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
• MCS mode register, value is either 167 or 199.(mcs_mode)
• Distance to the center of the corresponding range bin(range)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• Heights for overlap correction(overlap_correction_heights)
• Background signal, cross pol data(background_signal_cross_pol)
• Maximum altitude retrieved from multichannel scalar card.(max_altitude)
• Overlap correction(overlap_correction)
• Number of detector channels(num_channels)
• Deadtime correction factor(deadtime_correction)
• Polarization control enabled flag(polarization_control)
• Polarization control voltage setting(polarization_control_voltage)
• Number of bins stored in data block(num_bins)
• Attenuated backscatter, cross pol(signal_return_cross_pol)
• Attenuated backscatter, co-pol(signal_return_co_pol)
• Background signal standard deviation, cross-pol(background_signal_std_cross_pol)
• Dead time correction flag(dead_time_corrected)
• Distance from leading edge of first range bin to the center of each bin .(range_bins)
• Preliminary cloud base height above ground level(preliminary_cbh)
• Height(height)
• Laboratory measured counts used to calculate the deadtime correction samples(deadtime_correction_counts)
• Telescope temperature(scope_temp)
• Background signal standard deviation, copol data(background_signal_std_co_pol)
• Subtract from range_bins to yield range(range_offset)