| System                | Chemical shift (ppm) | Chemical shift (ppm) | Chemical shift (ppm) | References   |
|                       | Al(4)                | Al(5)                | Al(6)                |              |
| Al2O3-P2O5 glass      | +36                  | +4                   | -22                  | [27]         |
| Al2O3-P2O5 cryst.     | +40                  | -                    | -15                  | [27]         |
| Na2O-Al2O3-P2O5 glass | +40                  | +15                  | -10                  | [38]         |
| K2O-SiO2-P2O5 glass   | +44                  | +17                  | -17                  | [29]         |
| CaO-Al2O3-P2O5 glass  | +36                  | +4                   | -21                  | [27]         |
| PbO-Al2O3-P2O5 glass  | +40                  | +11                  | -12                  | [21]         |
| MgO-Al2O3-P2O5        | +35                  | +7                   | -18                  | [22]         |
| Amorphous alumina     | +62                  | +28                  | -4                   | [25]         |
| CdO-Al2O3-P2O5 glass  | +36                  | +6                   | -20                  | Present work |

Caption: Average 27Al chemical shifts and co-ordinations found in phosphate glasses

You are provided with a table from a material science paper. Here are JSON templates for two types of numeric cells: "Other" and "Glass_Compound_Amount":
{"value": "xx", "type": "Other"}
{"value": "xx", "type": "Glass_Compound_Amount", "constituent": "xx", "unit": "xx", "material": "xx"}

Please describe all numeric cells in the above table following the JSON templates (proceeding by row in a left-right, top-down direction). For each cell, output one JSON description per line. For any unanswerable attributes in the templates, set their value to the placeholder "xx".

Cell Description:
{"value": "+36", "type": "Other"}
{"value": "+4", "type": "Other"}
{"value": "+40", "type": "Other"}
{"value": "+40", "type": "Other"}
{"value": "+15", "type": "Other"}
{"value": "+44", "type": "Other"}
{"value": "+17", "type": "Other"}
{"value": "+36", "type": "Other"}
{"value": "+4", "type": "Other"}
{"value": "+40", "type": "Other"}
{"value": "+11", "type": "Other"}
{"value": "+35", "type": "Other"}
{"value": "+7", "type": "Other"}
{"value": "+62", "type": "Other"}
{"value": "+28", "type": "Other"}
{"value": "+36", "type": "Other"}
{"value": "+6", "type": "Other"}