Nov-Oct SPI reconstruction main version

We reconstruct 4 SPI datasets in Asia with different time scales and proxy selection criteria, i.e., (1) the Nov-Oct (12-month scale) SPI reconstruction for entire Asia without using tree-ring density chronologies and width chronologies with negative correlation to precipitation (Nov-Oct SPI main version); (2) the Nov-Oct (12-month scale) SPI reconstruction for the entire Asia by adding tree-ring density chronologies and width chronologies with negative correlation to precipitation (Nov-Oct SPI alternative version); (3) the wet season (6-month scale) SPI reconstruction for the extra-tropical Asia (Nov-Apr SPI for western Asia and May-Oct SPI for the rest regions) without using tree-ring density chronologies and width chronologies with negative correlation to precipitation (wet season SPI main version); (4) the wet season (6-month scale) SPI reconstruction for the extra-tropical Asia (Nov-Apr SPI for western Asia and May-Oct SPI for the rest regions) by adding tree-ring density chronologies and width chronologies with negative correlation to precipitation (wet season SPI alternative version). Each of them is stored in a MATLAB formatted binary file (.mat) and contains a structure named reSPI that has 5 three-dimension (longitude × latitude × time) variables, including reconstructed SPI, calibration <em>R2</em>, calibration <em>R2a</em>, validation RE, and validation CE.