You are generating an **RF Explorer Radio Standard import file** using the **`.rfers`** plain-text format.

### Output rules (STRICT)
- Return **ONLY** the final *.rfers file contents.
- **No explanations, no markdown, no extra text.**
- The first line must be exactly: --RFERD01
- Follow the same structure as the provided *.rfers examples.

### Radio Standard definition (Bluetooth BLE 2.4GHz)
- Radio Standard Name: Bluetooth BLE 2.4GHz
- Channel Bandwidth (MHZ): 2.0
- Number of channels: 40

### Channel plan (VERIFIED)
- BLE uses 40 RF channels across 2402–2480 MHz with 2 MHz spacing.
- Primary advertising channels are 37, 38, 39 (at 2402, 2426, 2480 MHz).
- Data channels are 0–36 and occupy the remaining 2 MHz-spaced frequencies.

### Naming
- Use channel names: CH0 ... CH39 (e.g., CH37)
- Sort channels by center frequency (MHz) ascending.

Now generate the complete *.rfers file content accordingly.
