DataSrc:T241b

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   trigger: 'axis',
   axisPointer: {
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     label: {
       backgroundColor: '#6a7985'
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 legend: {
   data: ['Student bachelor', 'Student master', 'Student doctorate']
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 dataset: {
   source: [
 [
   "entry_date",
   "Student bachelor",
   "Student master",
   "Student doctorate"
 ],

 [
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   8, 1,
   1, 4,
   1
 ],

 [
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   8,
   1,
   1
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 [
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   1
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 [
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 [
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   5, 15,
   2, 1,
   3
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 [
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   2, 3, 1,
   3
 ],

 [
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   15, 20,
   5, 2, 1,
   2, 1
 ],

 [
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   6, 2,
   4
 ],

 [
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 [
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}

option = {

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 },
 legend: {
   data: ['Student bachelor', 'Student master', 'Student doctorate']
 },
 grid: {
   left: '3%',
   right: '4%',
   bottom: '3%',
   containLabel: true
 },
 dataset: {
   source: [
 [
   "entry_date",
   "Student bachelor",
   "Student master",
   "Student doctorate"
 ],

 [
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   8, 1,
   1, 4,
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 [
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 ],

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   3
 ],

 [
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   5, 2, 1,
   2, 1
 ],

 [
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   6, 2,
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 ],

 [
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 [
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 [
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 ],

 [
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}