| Etching time (sec) | Cross-sectional radius (mm) | R0/R  | z (mm)  |
| 0                  | 50+-1                       | 0.408 | 10.2+-1 |
| 2                  | 48.5+-1                     | 0.402 | 9.8+-1  |
| 4                  | 47+-1                       | 0.395 | 9.3+-1  |
| 6                  | 45.5+-1                     | 0.390 | 8.9+-1  |

Caption: The results of fiber etching experiments showed that the fiber began unbending when the surface was removed by etching.

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": "0", "type": "Other"}
{"value": "50", "type": "Other"}
{"value": "0.408", "type": "Other"}
{"value": "10.2", "type": "Other"}
{"value": "2", "type": "Other"}
{"value": "48.5", "type": "Other"}
{"value": "0.402", "type": "Other"}
{"value": "9.8", "type": "Other"}
{"value": "4", "type": "Other"}
{"value": "47", "type": "Other"}
{"value": "0.395", "type": "Other"}
{"value": "9.3", "type": "Other"}
{"value": "6", "type": "Other"}
{"value": "45.5", "type": "Other"}
{"value": "0.390", "type": "Other"}
{"value": "8.9", "type": "Other"}