Task: Formula-prediction-context (source dataset: enron-random)

You are given an table region extracted from a real Excel spreadsheet, which is centered around a cell called "Target Cell" (labeled as "[Target Cell]" shown in the table below). The table region below includes up to 10 rows above/below the Target Cell, and 10 columns to the left/right of the Target Cell. 

Your task is to analyze the table context surrounding the Target Cell, and predict the most likely Excel formula that should go in the Target Cell. If multiple formulas are possible, choose the most reasonable or commonly used based on context.

1. Please follow the standard formula syntax in Excel, e.g. always begins with an equal sign (=).
2. Base your predicted formula on the surrounding table context, e.g., column headers, annotations, and data values in nearby cells.
3. No explanation — just output the formula itself in a JSON format: {"formula": "your_formula_here"}.

Input Excel Snippet in Markdown format:
|     | A                | B                   | C                            | D                                                                        | E                      | F        | G                                        | H                                                                        | I                      | J        | K                                        | L                                                                        | M                      |
|----:|:-----------------|:--------------------|:-----------------------------|:-------------------------------------------------------------------------|:-----------------------|:---------|:-----------------------------------------|:-------------------------------------------------------------------------|:-----------------------|:---------|:-----------------------------------------|:-------------------------------------------------------------------------|:-----------------------|
| 497 | TCO / Transco Z1 | Transco Z1          | 2.61                         | Transco Z1 to Emporia                                                    | 0.0418                 | 0.0458   | 2.7771                                   | TCO Shorthaul                                                            | 0.0                    | 0.01     | 2.8051                                   |                                                                          | 0.0                    |
| 498 | TCO / Transco Z2 | Transco Z2          | 2.625                        | Transco Z2 to Emporia                                                    | 0.0396                 | 0.0423   | 2.7805                                   | TCO Shorthaul                                                            | 0.0                    | 0.01     | 2.8086                                   |                                                                          | 0.0                    |
| 499 | TCO / Transco Z3 | Transco Z3          | 2.725                        | Transco Z3 to Emporia                                                    | 0.037                  | 0.0381   | 2.8699                                   | TCO Shorthaul                                                            | 0.0                    | 0.01     | 2.8989                                   |                                                                          | 0.0                    |
| 500 |                  |                     |                              |                                                                          |                        |          |                                          |                                                                          |                        |          |                                          |                                                                          |                        |
| 501 |                  |                     |                              |                                                                          |                        |          |                                          |                                                                          |                        |          |                                          |                                                                          |                        |
| 502 |                  |                     |                              |                                                                          |                        |          |                                          |                                                                          |                        |          |                                          |                                                                          |                        |
| 503 |                  |                     |                              |                                                                          |                        |          |                                          |                                                                          |                        |          |                                          |                                                                          |                        |
| 504 |                  |                     |                              |                                                                          |                        |          |                                          |                                                                          |                        |          |                                          |                                                                          |                        |
| 505 |                  |                     |                              |                                                                          |                        |          |                                          |                                                                          |                        |          |                                          |                                                                          |                        |
| 506 |                  |                     |                              | Path 1 ----------------------------------------------------------------> |                        |          |                                          | Path 2 ----------------------------------------------------------------> |                        |          |                                          | Path 3 ----------------------------------------------------------------> |                        |
| 507 | Gas Day:         | 2001-10-26 00:00:00 | [Target Cell]                |                                                                          |                        |          |                                          |                                                                          |                        |          |                                          |                                                                          |                        |
| 508 | Path             | Gas Daily           | Input Gas Daily Price($/dth) | Transport                                                                | Commodity Rate ($/dth) | Fuel (%) | Net Cost at Delivery Point of FT ($/dth) | Transport                                                                | Commodity Rate ($/dth) | Fuel (%) | Net Cost at Delivery Point of FT ($/dth) | Transport                                                                | Commodity Rate ($/dth) |
| 509 | CNG / TGP Z1     | TGP Z1 - 500        | 3.145                        | TGP Z1 to Z4                                                             | 0.0522                 | 0.0506   | 3.3648                                   | CNG to Quantico                                                          | 0.1043                 | 0.0228   | 3.5476                                   | VNG Pipeline                                                             | 0.0                    |
| 510 | CNG / TGP Z0     | TGP Z0              | 3.11                         | TGP Z0 to Z4                                                             | 0.0522                 | 0.058    | 3.3537                                   | CNG to Quantico                                                          | 0.1043                 | 0.0228   | 3.5362                                   | VNG Pipeline                                                             | 0.0                    |
| 511 | CNG So Points    | CNG South           | 3.51                         | CNG South to Quantico                                                    | 0.1043                 | 0.0228   | 3.6962                                   | VNG Pipeline                                                             | 0.0                    | 0.0025   | 3.7055                                   |                                                                          | 0.0                    |
| 512 | CNG No Points    | CNG North           | 3.58                         | CNG North to Quantico                                                    | 0.1043                 | 0.0228   | 3.7678                                   | VNG Pipeline                                                             | 0.0                    | 0.0025   | 3.7773                                   |                                                                          | 0.0                    |
| 513 | CNG/Transco Z2   | Transco Z2          | 3.12                         | Transco Z2 to Leidy                                                      | 0.045                  | 0.0504   | 3.3306                                   | CNG to Quantico                                                          | 0.1043                 | 0.0228   | 3.5126                                   | VNG Pipeline                                                             | 0.0                    |
| 514 | CNG/Transco Z3   | Transco Z3          | 3.21                         | Transco Z3 to Leidy                                                      | 0.0424                 | 0.0462   | 3.4079                                   | CNG to Quantico                                                          | 0.1043                 | 0.0228   | 3.5917                                   | VNG Pipeline                                                             | 0.0                    |
| 515 | TCO / Col Gulf   | Col Gulf LA         | 3.135                        | Col Gulf IT-2 to Rayne                                                   | 0.0388                 | 0.00697  | 3.1958                                   | Col Gulf Rayne to Leach                                                  | 0.0192                 | 0.02902  | 3.3105                                   | TCO to City Gate                                                         | 0.0226                 |
| 516 | TCO Pool Sourced | TCO Appalachia      | 3.465                        | TCO Pool to VNG City Gate                                                | 0.0226                 | 0.02776  | 3.5865                                   |                                                                          | 0.0                    | 0.0      | 3.5865                                   |                                                                          | 0.0                    |
| 517 | TCO / Transco Z1 | Transco Z1          | 3.1                          | Transco Z1 to Emporia                                                    | 0.0418                 | 0.0458   | 3.2906                                   | TCO Shorthaul                                                            | 0.0                    | 0.01     | 3.3238                                   |                                                                          | 0.0                    |



min_row: 497
max_row: 517
min_col: 1
max_col: 13
target_cell_row_idx: 507
target_cell_col_idx: 3
target_cell_value: 3.5018
formula: =Q522