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+//! FIF (FIFF - Functional Imaging File Format) reader.
+//!
+//! FIF is the native format for Elekta/Neuromag MEG systems.
+//! It uses a tag-based hierarchical structure with blocks containing
+//! measurement info, raw data, and various metadata.
+//!
+//! ## Format Overview
+//!
+//! - **Tag-Based**: Data organized as Type-Length-Value (TLV) tags
+//! - **Hierarchical**: Nested blocks (MEAS_INFO, RAW_DATA, etc.)
+//! - **Binary**: Little-endian, multiple data types
+//! - **Split Files**: Large recordings split across multiple files
+//!
+//! ## Usage
+//!
+//! ```rust,ignore
+//! use rtx_neuro_io::fif::FifReader;
+//!
+//! let reader = FifReader::open("sample_raw.fif")?;
+//! let info = reader.info();
+//! let data = reader.read_raw_data(0.0, 10.0)?;
+//! ```
+//!
+//! ## References
+//!
+//! - MNE-Python FIFF implementation
+//! - <https://github.com/mne-tools/fiff-constants>
+
+mod constants;
+mod reader;
+mod tag;
+
+pub use constants::*;
+pub use reader::{FifChannel, FifInfo, FifReader};
+pub use tag::{FifDataType, FifTag};