| 
        
          | Plot ?
 | Symb ?
 | Source *
 | Average    ? | Thresholds ? | N_ data
 | QC1 parameter
 | Data downloads
 | Remarks |  
	  | method | value | unit | method | value |  
| 1 |  | QC1DB | MEDIAN | -2.81e+04 | ADU | none |  | 64 | darkmed | this |
    last_yr |
    all | median DARK level of the imaging detector |  
| 2 |  | QC1DB | MEDIAN | -3.1e+04 | ADU | none |  | 125 | darkmed | this |
    last_yr |
    all | median DARK level of the spectroscopic detector |  
          |  |  
          | *Data sources: QC1DB: QC1 database; LOCAL: local data source |  
| Plot 1 scores: not implemented
 |  | data source: | visir_dark_img (QC1 database)
 |  | dataset: | darkmed |  |  | median: | -2.81e+04 | ADU |  | thresholds: | none |  |  | N_data plotted: | 64 |  | [click on plot for closeup] | This plot
| Plot 2 scores: not implemented
 |  | data source: | visir_dark_spc (QC1 database)
 |  | dataset: | darkmed |  |  | median: | -3.1e+04 | ADU |  | thresholds: | none |  |  | N_data plotted: | 125 |  | [click on plot for closeup] | 
Historical measurements of the dark level with the pre-upgrade
detectors, both for imaging and for spectroscopy. 
        
       General information
 
 Click on any of the plots to see a close-up version. The latest date is indicated on top of the plot. If configured, 
data points belonging to the latest date are specially marked
statistical averages are indicated by a solid line, and thresholds by broken lines
outliers are marked by a red asterisk. They are defined as data points outside the
threshold lines
"aliens" (= data points outside the plot Y limits) are marked by a red arrow (↑ or ↓)
you can download the data for each parameter set if the 'Data downloads' link shows up
 |