Fig. 1
Top: all photographic plate measurements between 1890 and 1951 available in the literature. Upper limits are indicated with light grey arrows. Bottom: all visual (small open circles) and photometric V-band (green asterisks) detections available in the AAVSO database that passed the AAVSO validation tests. Also plotted are visual (open triangles) and V-band observations available in the literature, as well as the RoboScope V-band data (all red filled triangles).
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