Card: heatmap with separated human column; consistent ST (legacy) label

README.md

@@ -74,10 +74,10 @@ From R, or any tool, download a starter sample's files directly, for example
 
 ## Is my tissue here?
 
-![GEO samples per organ and platform](assets/dataset-card/v3/05-organ-platform.png)
+![GEO samples per organ and platform](assets/dataset-card/v4/05-organ-platform.png)
 
-*Samples whose GEO tissue text matches each organ, by platform. The right column counts human samples across
-all platforms. Counts are approximate because tissue labels are free text; use the search for exact cohorts.*
+*Samples whose GEO tissue text matches each organ, by platform. The separate right column counts the human
+samples within each row, across all platforms. Counts are approximate because tissue labels are free text; use the search for exact cohorts.*
 
 <details><summary>The same numbers as a table</summary>
 
@@ -215,7 +215,7 @@ architecture. 561 H&E images have 1 µm per pixel or finer, enough to see cells
 
 ## Sample size
 
-![Observations per sample by platform](assets/dataset-card/v3/07-sample-size.png)
+![Observations per sample by platform](assets/dataset-card/v4/07-sample-size.png)
 
 *Observations per sample (log scale). A sample is one GEO sample (GSM), usually one tissue section. Spots, bins,
 beads and cells differ in size, so compare platforms by their own unit.*