| Chandra X-ray Center | 	PI: Dr Steven Allen  | 
| Parameter | Value | Description | 
|---|---|---|
| ASCDSVER | 7.6.8 | ASCDS version number | 
| DATE | 2006-07-11T12:55:56 | Date and time of file creation | 
| DATE-OBS | 2003-08-18T12:41:23 | Observation start date | 
| DATE-END | 2003-08-19T21:36:23 | Observation end date | 
| RA_PNT | 215.94579419569 | Pointing RA | 
| DEC_PNT | 24.057658777781 | Pointing Dec | 
| ROLL_PNT | 266.23888599173 | Pointing Roll | 
| RA_TARG | 215.949167 | Observer's specified target RA | 
| DEC_TARG | 24.078167 | Observer's specified target Dec | 
| DATAMODE | VFAINT | Data mode | 
| READMODE | TIMED | Read mode | 
| FP_TEMP | 153.4460144 | Focal Plane Temperature [K] | 
| FSW_VERS | 30 | ACIS flight software version number | 
| Parameter | Value | Description | 
|---|---|---|
| ASCDSVER | 7.6.8 | ASCDS version number | 
| DATE | 2006-07-11T14:01:53 | Date and time of file creation | 
| DATE-OBS | 2003-08-18T12:41:23 | Observation start date | 
| DATE-END | 2003-08-19T21:36:23 | Observation end date | 
| INSTRUME | ACIS | Instrument | 
| DETNAM | ACIS-23567 | Detector | 
| GRATING | NONE | Grating | 
| OBJECT | MACS1423.8+2404 | Source name | 
| TITLE | COSMOLOGICAL CONSTRAINTS FROM THE X-RAY GAS MASS FRACTION IN THE MOST LUMINOUS, RELAXED CLUSTERS | Proposal title | 
| OBSERVER | Dr Steven Allen | Principal investigator | 
| OBS_ID | 4195 | Observation id | 
| SEQ_NUM | 800351 | Sequence number | 
| RA_NOM | 215.94579419569 | Nominal RA | 
| DEC_NOM | 24.057658777781 | Nominal Dec | 
| ROLL_NOM | 266.23888599173 | Nominal Roll |