1. Introduction
2. The CALIFA DR1 Sample
3. Data Processing and Error Propagation
3.1. Improvements on the CALIFA Data Reduction Scheme
3.2. Accuracy of the Propagated Noise
3.3. Characterization of Spatially Correlated Noise
4. CALIFA Data Format and Characteristics
4.1. Error Datacubes
4.2. Bad Pixel Datacubes
4.3. FITS Header Information
5. Data Quality
5.1. Initial Reduction Pipeline Flags
5.2. Astrometric Accuracy and Spatial Resolution
5.3. Wavelength Calibration Accuracy
5.4. Spectrophotometric Quality and Accuracy
5.5. Limiting Sensitivity and Signal-to-Noise
5.6. Overall Quality Judgment
6. Access to the CALIFA DR1 Data
6.1. The CALIFA DR1 Search and Retrieval Tool
6.2. CALIFA Galaxy Explorer Page
6.3. Virtual Observatory Services
6.4. Visualization of CALIFA Data
7. Conclusions