CRUTEM4
----------------------------
Data are stored in ASCII

All values are stored as temperature anomalies in degrees celsius
Missing data are set to the value given in the header. (normally -1.0e-30)

Grids are 5x5deg monthly

The day (irrelevent here), month and year are stored at the start of each month.

Field status flags indicate whether the field is finalised ("f") or preliminary ("p").
- Finalised fields are fixed and will not be updated under the current version number.
- Preliminary fields may be updated in future monthly updates if additional data
  becomes available.


Data Array (72x36)
Item (1,1) stores the value for the 5-deg-area centred at 177.5W and 87.5N
Item (72,36) stores the value for the 5-deg-area centred at 177.5E and 87.5S


          ----- ------ ----- ------ ------- --------------------- ------------ -------------- 
         |     |      |     |      |       |                     |            |              | 
         | YR  |  MON | DAY | ROWS | COLS  | MISSING_DATA_VALUE  |   VERSION  | FIELD_STATUS |
         |_____|______|_____|______|_______|_____________________|____________|______________|________
     90N |(1,1)                                                                                        |
         |                                                                                             |
         |                                                                                             |
         |                                                                                             |
         |                                                                                             |
         |(1,18)                                                                                       |
     Equ |                                                                                             |
         |(1,19)                                                                                       |
         |                                                                                             |
         |                                                                                             |
         |                                                                                             |
         |                                                                                             |
     90S |(1,36)________________________________________________________________________________(72,36)|
          180W                                           0                                         180E