| Label                         | 0-F  | 5-F  | 10-F | 15-F |
| Optical band gap (Eopt ) (eV) | 3.55 | 3.43 | 3.22 | 3.20 |
| Urbach energy (EU ) (eV)      | 0.33 | 0.22 | 0.20 | 0.17 |
| Fermi energy (Ef ) (eV)       | 4.16 | 4.10 | 3.86 | 3.81 |

Caption: Optical band gap, Urbach energies and refractive indices for all samples.

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": "3.55", "type": "Other"}
{"value": "3.43", "type": "Other"}
{"value": "3.22", "type": "Other"}
{"value": "3.20", "type": "Other"}
{"value": "0.33", "type": "Other"}
{"value": "0.22", "type": "Other"}
{"value": "0.20", "type": "Other"}
{"value": "0.17", "type": "Other"}
{"value": "4.16", "type": "Other"}
{"value": "4.10", "type": "Other"}
{"value": "3.86", "type": "Other"}
{"value": "3.81", "type": "Other"}