Check Dpm spectra

1 Dpm signal
https://drupal.star.bnl.gov/STAR/system/files/Dpm_ch1_hist.pdf
2 Dpm spectra

3 Compare with Guannan
https://drupal.star.bnl.gov/STAR/system/files/Dpm_LZ_vs_GNX.pdf
4 Clear bad data point
drupal.star.bnl.gov/STAR/system/files/Work_Update_20170107_Dpm_spectra_check.pdf

Updates : 2017-01-11
We updated the cuts for D+/- reconstruction, then the D+/- signal is much more clean (compare with previous signal.)
compare with Guannan's results :

drupal.star.bnl.gov/STAR/system/files/Work_Update_20170110_Dpm_spectra_check.pdf

5 : remove data from day before 107
  https://drupal.star.bnl.gov/STAR/system/files/Dpm_LZ_vs_GNX_remove_day_before_107.pdf