Additional file 4 of A low-dispersion spectral video camera for observing lunar impact flashes

Additional file 4. Additional_SER_video_files: The spectra of Flash170201 can be derived from these files. We cropped the video frames to reduce the file sizes. Ser-format videos can be viewed by an open-source application, “SER Player (2021).” (1) Flash170201.ser: Flash170201. The flash appears in the 51st-frame. The bright area at the upper right is the Aristarchus area. The original frame size is 960 × 592 pixels. We extracted one hundred frames of 200 × 200 pixels in size. The coordinate of their upper-left pixel is (670, 290) in the original frames, in which the coordinate of the upper-left pixel is (0, 0). We averaged 495 frames while shifting images to compensate for slight image motion in obtaining the background image. Therefore, the analyses of this cropped video may lead to slightly different results from ours. (2) TYC4665-715-1.ser: Comparison star. A faint star at the lower left is TYC4665-463-1. The original frame size is 960 × 592 pixels. We extracted one hundred frames of 120 × 100 pixels in size. The coordinate of their upper-left pixel is (355, 315) in the original frames. We averaged all frames while shifting images to compensate for slight image motion. (3) alpha-And_No5.ser: α And recorded at the center of the original video frames. The original frame size is 1936 × 1216 pixels. We extracted one hundred frames of 120 × 100 pixels in size. The coordinate of their upper-left pixel is (870, 538) in the original frames. We discarded five bad frames and averaged the other frames while shifting images to compensate for slight image motion. (4) alpha-And_No6.ser: α And recorded near the right edge of the original video frames. The original frame size is 1936 × 1216 pixels. We extracted one hundred frames of 120 × 100 pixels in size. The coordinate of their upper-left pixel is (1780, 538) in the original frames. We discarded one bad frame and averaged the other frames while shifting images to compensate for slight image motion. (5) dark_for_Flash170201.ser, dark_for_TYC4665-715–1.ser, dark_for_alpha-And_No5.ser, dark_for_alpha-And_No6.ser: Dark frames for the SER videos mentioned above. These were recorded while we covered the camera with an opaque cap. The camera settings were the same between the non-dark and dark videos.