score:1

Accepted answer

Select the first tick line, the one at the bottom, and remove it. JSFiddle

  svg.append("g")
    .attr("class", "y axis")
    .call(yAxis)
    .call(g => g.select('.tick:first-of-type line').remove())
    .call(g => g.selectAll(".tick line")
      .attr("class", "axis_bar")
      .attr("stroke", "#E8E8E8"))

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